Multiple Sclerosis is a disease of the central nervous disorder that weakens the immune system. A study showed that obese adolescent girls affected by MS have opportunities in the future. During the 40-year study of 238,000 women found that adolescent girls suffer from obesity at the age of 18 years had twice the risk of MS affected than teens of that age have more slender bodies. Fatty tissue which accumulates as a teenager allegedly memproduki substances that affect the immune system that triggers the possibility of MS. However, body size during the children and adults are not found in relation to risk of MS. Researchers have made a study report in the journal Neurology. Researchers still need to take further evidence to confirm these findings. Researchers from the Harvard School of Public Health used data from the nurses about diet, lifestyle factors and health. During the study, 593 women are diagnosed with MS, a disease caused by loss of nerve fibers and myelin sheath in the brain and spinal cord that makes nerve damage. Researchers compared the risk of disease with body mass index (BMI) or weight to height ratio, in women aged 18 years. Studies show those who have weight BMI 30 or greater at the age of 18 years had twice the risk of MS. Our results indicate that body weight during adolescence is very important in determining the risk of MS, said Kassandra Munger ScD from Harvard School of Public Health in Boston, as quoted by BBC News, Monday (9/11/2009). There are many studies that support that adolescence is an important time for the development of the disease, so what we found was associated with it, he said. He added that obesity prevention early adolescence is an especially important step in reducing the risk of MS in the future. Previous research has found vitamin D levels are high can reduce the risk of MS and the researchers showed that obesity associated with low levels of vitamin D in the body.

Everyone knows that exercise can heal the body. But why only a few people who routinely perform the activity? Ask yourself. The answer is, maybe you less motivated to do so. A survey ever conducted to find out why people rarely do sports. The survey involving 15,000 women from 25 countries showed that although nearly half of them know that exercise is very important for health, but less than 25 percent of it done. Why? More than two-thirds of respondents said that they would exercise more often if the gym was fun. So far, they consider it as a routine or demand to stay healthy so feel burdened. Although the facts say so, but it is unfortunate if people take sport as a less desirable activity. If you are not motivated to do the morning run, bike or fitness, try these few tips that may improve your mood for a workout without having to feel it as a demand or load. 1. Participate In A Club
Come in a club full of adventure and can arrange your sporting activity each week. Find information from friends or open the website that provides these facilities. 2. Involve Friends
If you are interested in joining a club, you can do sports with your friends or beloved. Sport activities together can evoke passion and spirit to not realize that you are really doing is exercise, not just recreation. 3. Try New Types
Trying something new will make you feel to have new experiences and unexpected. Make your muscles work with the new type of sport and do not usually very good for your body. 4. Make A Game
You would be very interested in an adventure or a game. Making sport like games is a good idea. Make activities as the game ran find treasure limited time, and you will feel more happy and challenged. 5. Back to Boyhood
Do you remember when as a child running around all day without feeling tired and bored? It feels good right? That s what you should do now. Create a day where you can be reunited with friends and do sports or play activities you usually do in childhood. Rollerblading in the park to play or jump rope can be very enjoyable. 6. Give Credits For Yourself
If you ve managed to do sports, try giving a gift to yourself. Watching the film series, enjoying a plate of spaghetti or relax at the spa can be temoat rewards you deserve for successfully achieving exercise goals. Most people who do not enjoy the sport has a very dense activity and also because they are not used to doing. But if once you find that it is a routine exercise that is enjoyable, you will begin to enjoy it. Without realizing it, you also have to do two things at once is fun, physical exercise and psychological. Good luck.

Vierra band to be different in 2010. The personnel men, Kevin cs, want to look more muscular. Of course there are reasons why the personnel Ballerina boys want to look more muscular. Raka Cyril, the guitarist, spoke up to express that excuse. . To create a more muscular body would need a business. So, Kevin (keyboards), Raka (guitar) and Tryan (drums), do not forget the additional bass player, Deryansha Azhary, melakoni fitness. Fitness together can maintain cohesion, said Raka again. The desire for fitness with the new fact emerged two weeks ago. At that time only as an expense only. But after thinking together, three boys Vierra agreed to be different in 2010. Apart from personnel appearance that her boyfriend would be more muscular, there is no change from the Ballerina in 2010. Band with hits Are You Really it was not planning to release a new album. We do not want to hurry. s Album coming out yesterday, not to waste too, added Widi, the vocalist.

A few days ago, I woke up to the fact that Google has become yet another MSN. The stupid opt-out policy of their latest gadget, Google Buzz, means that I can no longer entrust Google with anything. In case it wasn't obvious to the idiots at Google, no, I do not want every single person that ever sent me a random e-mail to suddenly get automated access to whatever on-line content I'm producing; I want to choose who will get access to what and be able to change my mind about what any particular individual will get access to at any given time. Most of all, I want this to be opt-in by default. That is, unless I explicitly enabled access to some specific content to a specific individual, the assumption shall be that nobody has access to anything that I produce. Alas, it seems too much to ask from Google. So now I'm looking for a reliable no-frills webmail service that is too boring to ever get under the radar of any media content giant. First, it was Hotmail no more, now it's Google no more. I also have another simple request: that the selected e-mail address can include hyphens and periods. If anybody knows of any such simple and reliable on-line webmail service, please drop me a line via this blog article's comments. Thanks!

The Telegraph has a silly article titled Aliens are likely to look and behave like us [1]. It s based on the ideas of Professor Simon Conway Morris [2] who is a big fan of evolutionary convergence. He seems to believe that humans evolved in a way that is close to optimal and that aliens would have to evolve in a similar manner. The article s claim that aliens will look and behave like us has three flaws, one is assuming that humans are the ideal form for space travel, another is the significant possibilities for vast objective differences between species, and the final one is the human tendency to regard small differences as being really significant. The Arrogance of Assuming that Humans are Ideal. It seems extremely arrogant to assume that humans have the ideal form for performing tasks that we have not yet performed such as traveling to another star system. To assume that it is certain that humans will colonise the stars is also extremely arrogant and foolish as well, I think that a significant amount of money should be devoted to existential risks that we face. People who believe that humans will inevitably colonise the stars (probably because God told them there s no other reason for such certainty) will tend to oppose taking prudent measures to reduce the probability of failure. We should also consider the possibility that a human society that colonises another star system at some future time might be so different from us that we regard them as alien. How Might Aliens be Different? It seems to me that one problem with the theory of convergent evolution (as applied to different planets) is that evolution doesn t seem to work in big steps. It seems to me that for an increasing portion of the jobs in our technological society there would be a benefit in having four arms and two legs, and maybe having more than four fingers on two of the hands. But evolving a bone structure that makes four arms useful is not a minor tweak so it seems unlikely to happen naturally we might be able to genetically modify humans to have four arms and two legs with some future technology. I can t believe that four limbs is the optimal number for every mammal, amphibian and reptile (apart from the legless ones), that two legs plus two wings is the optimal number for every bird, and that six legs is the optimal number for every insect. I also can t believe that two arms and two legs is the optimum number for every primate with the only significant difference in limbs being the primates that possess a prehensile tail. Evolution doesn t produce perfect creatures, what it does is to produce creatures that tend to be slightly fitter than their ancestors. So even if there was an optimal form for a species that develops interstellar-craft, there would be no reason to assume that humans have such a form even if we had developed interstellar travel. I think it s relatively safe to assume that aliens would have two eyes (stereoscopic vision is a significant advantage), but apart from that I don t think we can assume much about their appearance. For example I don t think that there s any inherent reason why creatures as intelligent as current humans could not evolve from octopuses 8 arms would be quite useful for operating machines. Aliens that spread beyond their own home planet don t have to be optimal for such tasks, they only need to become the dominant species on their planet, develop decent technology, and then want to leave their planet. A species that took 100,000 years to achieve what humans have achieved in the past 100 years might not be considered optimal but it might still be able to eventually launch interstellar craft. I don t think it s reasonable to assume that aliens would have to be as intelligent as humans to do that. But it does seem most likely that any aliens who manage to get here would be more intelligent than us. Guns, Germs, and Steel: The Fates of Human Societies by Jared Diamond has a really interesting analysis of how human history was determined by geography and the availability of plants and animals suitable for domestication. Part of the explanation for the apparent lack of intelligent aliens could be planets where the dominant species was stuck in a situation like that of the people of New Guinea, the lack of plants and animals suitable for domestication prevented their society from developing. A stone-age human civilisation could potentially be stable for millions of years. The article says Extra-terrestrials might not only resemble us but have our foibles, such as greed, violence and a tendency to exploit others resources . Well for starters a species that can displace all other contenders to become the dominant species in their planet would have to be capable of greed and violence. So that is probably correct but is not really going out on a limb. Physorg.com has a short article describing the benefits of sexual reproduction in terms of the rate of accumulation of harmful mutations [3]. So it seems that sexual reproduction is most likely among intelligent aliens. But I don t think that there is any reason to assume that aliens couldn t be hermaphrodites. The Telegraph article claims that Star Wars and Star Trek could be more accurate than they ever imagined in depicting alien life , but given that Star Trek has avoided homosexuality even when demanded by the plot it seems that whatever aliens do in the bedroom would be way outside the range of activities alluded to in Star Trek. It seems that almost all sci-fi has aliens that are less alien than a significant portion of the human population. I think it s safe to predict that if we should meet aliens they will not look like humans wearing cheap make-up or rubber suits that has more to do with the budgets assigned to movie studios than any claim to potential realism. It seems most likely that a society capable of developing space travel would need a great deal of training for it s young before they become self-sufficient. Species of animal that abandon their eggs and hope for the best seem unlikely to succeed in doing that. I think that this implies that a pair-bonded species that spends an extended amount of time raising their young is most likely to succeed. Perceptions of Aliens Vulcans are widely regarded as being on the Autism spectrum. So it seems that having some similarities in personality to about 1% of the human population is enough to convince most human viewers that the character in question is an alien. A Google search for such things just turns up many references to people on the Autism spectrum who feel like aliens which incidentally is the source of the alias ETBE [4] that I used for more than 10 years before being diagnosed as an Aspie. Star Trek aliens aren t actually very alien by human standards! Given the repeated demonstrations of the general human inability to recognise the psychological similarities in people from different countries or racial/ethnic/religious backgrounds it seems likely that few people would recognise aliens as being at all similar to us. As so many people are unable to recognise the fundamental similarities in people who happen to have a different skin color I can t imagine many people immediately regarding beings that look like octopuses as having human traits. Could an eusocial organism (such as bees or ants) develop space travel? It seems to me that most people wouldn t regard humans who act in a manner that resembles ants (such as the Borg Collective) as being like us . The possibility of an eusocial race evolved from humans is explored in Coalescent: A Novel (Destiny s Children, Bk. 1) by Stephen Baxter (and more briefly in the sequels). Probability The universe is a large place. Making a specific prediction about the first alien species that we might encounter might make some sense. But given the potentially billions of species that might be out there we should assume that some of the more improbable forms are represented. Claiming that anything in particular is impossible seems very rash. Also anyone who makes claims about what evolution should do seems to have missed the point. What evolution does is to give rise to species that tend to be a better fit for the environment. Different environments result in different creatures. We can try and predict what creatures might evolve, but we don t get to say that things should happen.

• [1] http://www.telegraph.co.uk/science/science-news/7071013/Aliens-are-likely-to-look-and-behave-like-us.html
• [2] http://en.wikipedia.org/wiki/Simon_Conway_Morris
• [3] http://www.physorg.com/news183318256.html
• [4] http://en.wikipedia.org/wiki/Extraterrestrial_Biological_Entity

(maybe) After the two updates in the previous post, I got further and eventually fixed the root of the remaining problems on ARM. It appears I got on the wrong track at the very beginning of the investigation. My first test was to disable the JIT compiler during the tests, and it didn t affect the result. I assumed from there that the JIT compiler was doing fine and wasn t involved. Which led me to believe the alignment of the stack at 32-bits word boundary instead of 64-bits was a standard behaviour. I turns out my first test itself was wrong, because I hadn t disabled the JIT compiler at all. You need to modify the runxpcshelltests.py script to disable the JIT, and not fiddle with the javascript.options.jit.chrome preference. The JIT compiler was misaligning the stack, and disassembling the generated code leading to broken behaviour revealed that it was doing so when setting up arguments on the stack for function calls. While I was afraid this would be difficult to fix without changing a lot of code, and first only disabled the JIT compiler, it turns out the way nanojit works by compiling the last instructions first did make it straightforward to fix. But ARM was not the only RC buggy architecture left after sparc and powerpc were fixed. MIPS remained. Alpha fails, too, but it is not a release architecture. Update: It appears hurd fails too, but like Alpha, it is not a release architecture. So, while I didn t want to wait 50 hours for a build, I managed to execute a failing test with the last xulrunner-1.9.1 packages that got built (before I enabled the test suite) under qemu. And I was able to track down the origin of the bug: the xpcom layer that translate function calls between languages doesn t fill arguments correctly when they are smaller than 32 bits. While the code is adapted to the mipsel case, which is little endian, it doesn t work on mips, which is big endian. I came up with a patch that should work, and which I hope won t break mipsel as a consequence. All that is left to do is to build and test the fix. I hope someone else will be able to do that for me. All in all except a 1.9.1.8 release this week with a lot less red on the buildd status page.

This spring I'm taking a class that does all its programming assignments in MIT Scheme. The last time I had to write Scheme for class, we used PLT Scheme, and thus the DrScheme editor. This time, with that option out, I've decided to do the assignments in Emacs. It is, after all, an editor built out of lisp. I've used vim for the last five years or so. Some people ask me why this is so I do go to MIT after all, where Emacs was originally written. The answer to that is simply that Debian got to me first, and at the time at least, the people I knew there used vim. I've heard Emacs is good, but up until this point every time I've tried it I've thrown it down in frustration and then couldn't figure out how to exit the damn thing. This time I was more determined, and made it through the initial hump of being completely useless at the editor. Here are a few of my observations so far, after mucking around for a couple days over a period of about two weeks:

• The movement commands seem much more awkward to me. Since I'm using the Colemak keyboard layout, I have backspace bound to Caps-Lock, and it is not available to be a Control key. It may be that I just need some more time to get used to emacs not being modal.
• It's awkward to switch between split windows using C-x o when I have 4-6 open at a time. I'd like to be able to jump between specific ones directly.
• C-x 3 will always split the window containing the current buffer evenly in two, which makes it difficult to, for example, create three equally sized vertical windows, side-by-side. Vim defaults to creating evenly sized windows even when you invoke a split twice in a row.
• The paradigm of being able to have e.g. a scheme buffer or a shell as one of my split windows is nice, though I haven't yet gotten used to having to use emacs special bindings to interact with those buffers rather than what I'd use if I'd just invoked the command from a terminal.
• I noticed that emacs automatically detects the VCS in my directory. It seems incredibly bizarre to me to interact with my VCS from my editor. Do people actually do this?
• Emacs's use of the tab character to perform code indentation is interesting. It does solve the problem of code being auto-indented when you don't want it to, which sometimes happens to me in vim, but I wonder if it actually ends up saving keystrokes in the end, since I think not auto-indenting is the exception rather than the rule for me.
• There seem to be two different methods for completion: "dynamic abbrev" expansion, which I believe is analagous to what I'm used to in vim, and M-TAB (what a horrible keybinding, as most window managers will grab this for window-switching), which seems to be some sort of language-specific completion. I haven't yet seen how this can be harnessed since the symbolic completion seems to be irrelevant for scheme.
• Emacs's syntax highlighting gets at least one thing right about scheme that vim doesn't: extended comments between # # patterns.
• Bookmarks seem waaay more verbose/awkward than vim's marks. C-x r m NAME huh? I like being able to have a very short pattern to mark and jump back to points in a file, like vim's m/ syntax for marks. Maybe I'll need to bind the bookmark functions to something else.

I'm pretty sure at this point that I'm still trying to bend emacs into being vim with different keybindings instead of figuring out how emacs wants to be used. It's also difficult to compare and contrast between the two editors in that my .vimrc contains years of tweaks and customizations whereas my .emacs started out as a clean slate. There are two things I'm doing to try to mentally separate emacs from vim, to avoid my fingers' muscle memory from becoming confused:

1. I'm always using emacs in an X window with dark-on-light text, whereas I always use vim in a terminal with light-on-dark text.
2. I'm only writing scheme in emacs. No other languages so far.

I'm planning to keep working on these programming assignments in emacs, despite it being annoying slower than I would be in vim. Tips and pointers for improving my experience are welcome.

I ve just bought a Thinkpad T61 at auction for $AU796. My Thinkpad T41p has cooling problems which I have previously described[1]. It s also started to rattle a bit when I hold it upside down since I took it apart so I guess I didn t do a great job at trying to fix it (probably the fan is getting obstructed). Now it has developed some screen problems where the screen back-light will periodically turn off and stay off until I press and release the lid-close button (to turn the screen off and on again), this is apparently the symptom of a broken inverter [2]. I was quoted $160 to fix the inverter and $250 to replace the entire screen by laptop.com.au (a very reliable laptop sales and repair company that I ve dealt with before) [3]. Also the system has the red screen problem where intermittently the screen turns reddish so paying $250 for a replacement screen is worth considering. I decided not to do this as I have seen refurbished Thinkpad T41p systems on sale for about $400 and spending $160 now and possibly $250 later on a $400 system didn t seem like a good idea. One thing that has annoyed me about my Thinkpad for a long time is the lack of PAE support in the Pentium-M CPU which makes it impossible to run Xen [4], so upgrading to a newer system will allow me to use virtualisation for the purpose of fixing bugs in Debian/Unstable among other things. As I want a Trackpoint it seems that a Thinkpad is the best option (Thinkpads are also great in many other ways). So really all want is a new Thinkpad with an equal or higher resolution screen, more than 1.5G of RAM (what I ve currently got) and at least PAE (but ideally hardware virtualisation for KVM) as rumor has it that ACPI doesn t work well with Xen and also Xen has a history of being a little unreliable at the best of times. I m after a portable desktop replacement system, so I m not after an X series or anything else light either. Even though the new prices on Thinkpads are generally more than I want to pay I first checked the Lenovo web site. It sucks in a magnificent way. First there were some basic site navigation issues, such as the fact that I often can t click my middle mouse button on a link to open it in a new tab (I get some sort of Javascript error) it seems that the Lenovo web team didn t consider the possibility that I might want to have the details of different series of Thinkpad open in different tabs for the purpose of comparison. But the kicker is the fact that most Thinkpads don t have the screen resolution displayed! It seems to me that one of the most important factors in purchasing a laptop is the screen resolution and Lenovo generally don t provide it! The Ideapad is described as having a resolution of 1024*600 (a netbook not a laptop), the Thinkpad Edge has 1366*768 (not that good), and the R400 and R500 are WXGA which is anything between 1280*720 (sucky) and 1366*768 (slightly less sucky). So it seems that the low end models have technical details which could allow a potential customer to reject them, while the high end models don t have technical details needed to justify the purchase price! Fortunately a friend who works for IBM was able to find me the necessary information, this site allows you to enter the part number of any Thinkpad and receive a reasonably complete set of specifications (including display resolution) [5]. With the information on that site I was able to successfully bid on the single Thinkpad in a Lenovo auction of refurbished systems that had a resolution that was satisfactory. The fact that the Lenovo auctions of refurbished systems also lack the details is another think that Lenovo do wrong. In this case I started bidding one minute before the auction closed and had to push the price up by $125 to win it. Given the number of auctions that Lenovo runs world-wide they would probably benefit from fixing their web site just to get the occasional Thinkpad price increased by $125. Not to mention the number of people who are discouraged from buying new Thinkpads because they can t get information on what they might be paying for.

• [1] http://etbe.coker.com.au/2010/01/19/taking-thinkpad-apart/
• [2] http://www.laptoprepair101.com/laptop/2007/01/31/replace-screen-inverter-fix-backlight/
• [3] http://laptop.com.au/
• [4] http://etbe.coker.com.au/2008/05/02/the-future-of-xen/
• [5] http://www-307.ibm.com/pc/support/site.wss/quickPath.do?quickPathEntry=6457BP2

A few weeks ago, I ve added support for Remote, Apple s iPhone application for controlling iTunes remotely. Here, support means Remote can be paired with forked-daapd and can be used to browse the library. And that s it, for now. At this point, there won t be much visible activity on forked-daapd for some time. I m working on a couple of things, but they take time and they require a lot of new code. So, for a couple weeks now, I ve been working on that. I have some code outside forked-daapd that is starting to work well, but it s not there yet, far from it. Then it ll have to be integrated into forked-daapd, which means a lot of new code there too. Bug fixes will still happen in the meantime, and some smaller new features may also appear before the Big Thing . So if you find or encounter bugs, feel free to report them still. If you have patches or ideas you want to discuss, feel free too. As I wrote to a couple people by mail already, good things come to those who wait or contribute. With all that, I ve updated the Debian packages, given that there won t be important changes for a while; I hope they re useful to some of you out there. Note that I m making an amd64 binary package available alongside the source package; it s built on a current Debian unstable system, but if that s not suitable for you, in terms of dependencies or architecture, you can trivially build a suitable binary package from the source package. As a reminder, I have packages of the ANTLRv3 C runtime too. I ve also added antlr-3.1.3.jar there, in case you need it and can t find it at the upstream download site.

I don t think that the answer is everyone or even everyone other than my geeky friends , but obviously it is a large number of people. Many people apparently type facebook into Google and try to login to the first thing that they see, if it happens to not be Facebook then they whine this became known after a Google search for facebook login happened to not return the Facebook login page as the first link [1]. This blog post claims that they are not stupid [2] the specific claim is that URLs etc are just too complex. I disagree, if my mother and my mother-in-law can both do better than that then I think that we should expect that a significant portion of retirees can do so and we should also expect that younger people will do better than older people. In a more specific sense, when I was in primary school I was taught the Dewey Decimal System aka Dewey Decimal Classification. With the DDC a primary school student can look up the location of a book in the library index system (cardboard files when I was at school) and then know where to find it. After looking up a book on one occasion no-one would want to repeat the effort so the sensible thing to do is to write down the DDC index to any interesting book. The same mental processes can be used for dealing with URLs, someone might find Facebook etc through Google on the first occasion but they can then use browser bookmarks and written notes for traveling to track the URLs that interest them. I think we should expect that a typical adult nowadays should be able to complete any task that would be expected of a 10yo when I was young, and I don t think it s unreasonable to call an adult stupid if they can t compare to a 10yo from the early 80 s! As a specific example, while 10yo children were given assignments to look up various books in the DDC I think that an adult can be expected to work out the value of an index on their own young children should be expected to require a little more training than adults! Some people will claim that it s not stupidity but ignorance. What exactly is supposed to have prevented these people from learning? Have the primary school libraries stopped teaching the DDC and most other things related to storing written knowledge? Is there supposed to be such an utter lack of computer skills in the general population that anyone who wants to learn will be unable to do so? I m sure that there are plenty of retirees who could seek advice from my mother or my mother-in-law if they wanted to learn about such things. NB I m not making any general comment about gender specific computer skills here, my father and my father-in-law don t seem to use the Internet much and they aren t the ones to complain to me when things break so I can t assess their skills. I am talking about four individuals and the only generalisation that I am making is that 2/4 retirees I know well seem to have good Internet skills and therefore I expect there to be a reasonable number of retirees who successfully use the Internet. The Making Light analysis and discussion of the issue has a lot of good points (Making Light does in fact make light ) [3]. But does have some claims that I find really strange, one example concerns a woman who misunderstood the way the up/down buttons work to call an elevator. Misunderstanding the buttons is one thing, but she also shared her knowledge of elevators with others, presumably she had more than a few people try to correct her and she ignored their advice. I think that someone who ignores advice from a variety of people, ignores advice that can easily be tested (just push the elevator buttons and observe what happens), and then goes around sharing their wrong ideas seems to have clearly crossed the line separating cluelessness from stupidity. One of the Making Light comments references the Clients From Hell blog a summary of strange, stupid, and amusing requests that clients have made to web design companies [4]. It seems to me that there are two noteworthy categories of anecdote on that site. One is requests that demonstrate ignorance of the work, such as requesting something significant and complex to be done in an hour. The other is requests that demonstrate contempt for the people doing the work, such as offering to pay $10 per hour. Misjudging the time taken to complete work is forgivable if someone has the skill to accurately estimate the time required then they would be able to do the work and wouldn t be asking for a quote for someone else to do it. Demonstrating contempt for someone that you are about to hire is stupid no matter how or why it s done. Clients From Hell also documents people who have requests that are obviously silly, it s understandable that someone might expect a blurry image to be sharpened as done on CSI , but wanting use image editing to reveal the face of a person who was facing away from the camera is simply assigning magical powers to the computer the fact that this sort of thing is done in shows such as Star Trek says a lot about the shows in question and their viewers. Often car metaphors are used for computers, you can be a good driver without knowing the details of how a car works but you do have to know how the pedals, switches, and steering wheel work as well as the meanings of the various dials. You can be competent at using the Internet without knowing much about bits, bytes, assembler code, or how a CPU works but you do need to know how the controls work and this means knowing how to type a URL. The basic operations of browsing the web require considerably less skill than driving a car and less skill than is commonly used in operating the telephone system (including PABX systems, mobile phones, and international calls). Anyone who is unable (not unwilling) to drive a car or make any phone call other than a local direct call and yet is reasonably intelligent could be used as an example of how an intelligent person could be unable to understand some aspects of technology, I don t think that there are many people in that situation it s difficult to find an adult in Australia who can t drive a car. Finally while it s reasonable to be uninterested in some things, it s not reasonable to be interested in doing something without wanting to learn how to do it properly. If typing facebook.com is so difficult that it exceeds someone s level of interest in the service then they shouldn t complain if they find that they can t access the service. Really typing facebook.com into the address bar of a web browser is easier than starting the engine of a car with a manual transmission, it s easier than filling the fuel tank of a car with the correct fuel, or figuring out when a car is due for service. Now there are serious security issues revealed by this event. I m sure that lots of people use similar methods to access their online banking etc. I just did a quick Google search for online banking with Australian banks, and I noticed that a few of the search results have adverts from rival banks. So it seems quite plausible that someone could trick Google into thinking that they run a bank (there are many thousands of banks in the world), run adverts competing against established banks, and phish the people who click on them. I wonder whether the best solution would be for the banks to test the security of their customers. Then any customer who gets phished by the bank s anti-fraud division would receive increased bank fees for the next few years and the rest of us who are less risk to the bank could receive lower fees. The current situation seems to be that my bank fees are partly determined by the need to recoup the money that the bank loses from customers who just use Google to find their bank s web site. I would rather not pay for the stupidity of such people. In the end all security comes down to people issues, technology just helps people do the right thing. I believe that one of the groups of stupid people on the Internet are those who believe that the Internet should be made safe for people who want to know nothing about it not even the basic library skills that are taught to primary school students.

• [1] http://www.readwriteweb.com/archives/facebook_wants_to_be_your_one_true_login.php
• [2] http://quietbabylon.posterous.com/i-have-some-opinions-about-the-rww-facebook-l
• [3] http://nielsenhayden.com/makinglight/archives/012186.html
• [4] http://clientsfromhell.tumblr.com/

I'm using BackupPC to make backups from one computer to another. Usually no big deal, but between the two machines there's a VPN connection across two dialup connections and 450 km air line. So, there is a maximal usuable bandwidth of about 1 Mbps between both locations. The problem was now: host A (the machine which is backupped) was initially backupped by host B (the machine running BackupPC) when host B was still located right beside host A. In the meantiime host B has been moved to its remote location and there I excluded one or the other directory in the following backup. Now I wanted to include them again, thinking that BackupPC is clever enough to realize that those directories are already in the backup #0.

Sadly, BackupPC seems to just compare the latest full backup without considering the partial backup, that was filled during the last 14 days over the 1 Mbps link. So BackupPC began to pull all the 200 GB of data again, although it already got roughly 180 GB in the partial backup. The cause for the partial backup was a longer connection timeout between the two dialup hosts.

Because I don't wanted to pull all 180 GB again and again and again, I looked for another solution for the problem. And it is quite simple. Given are a full backup #0 and another backup #7. #0 is the initial, complete backup before the relocation. Backup #7 is the backup after the relocation where I omitted some directories that contains 200 GB of data. Backup #8 is the partial backup. What I now did was this:

• in /var/lib/backuppc/pc/host_A/ I created a new directory for backup #9 by issueing 'cp -al 0 9'
• next, copy the content of the other valid backups the same way
• edit 9/backupInfo and change the number of the bakcup like this: 'num' => '9'
• add another line in pc/host_a/backups for backup #9
• start another full backup of host A from the webinterface in BackupPC on host B again

BackupPC will now base its freshly started full backup on the directory contents of backup directory 9. When the backup finished, you can delete that backup directory #9 again. This works quite well for me and the transfer with rsync. Maybe there are other methods dealing with that problem. Feel free to leave some comments.

That is a question I hear more and more, and I felt it had to be answered publicly. Short answer: when it s ready. The current target for Squeeze is 3.5, for various reasons, but the main is that it shares the same Gecko version as Iceape (SeaMonkey) and Icedove (Thunderbird), which means that while the security team (or myself) will have to update these three for security updates, they will share patches. So 3.6 is less a priority than having 3.5 in shape for the release. Last week, I wrote on a mailing list post that I was expecting 3.6 to come this week. Well, that was before I discovered the sad reality about the state of the current version. But 3.6 is still on the radar. I already went through all the patches we apply on 1.9.1, and rebasing should now be straightforward. Most of the 3.5 failures have now also been addressed: sparc and powerpc were fixed first, and I am now (re-re-re -re)building on arm for, I hope, the last time. Unfortunately, mips is still missing, and without a porterbox, I can t do much. I tried, some time ago, in qemu, but there is no way I m going to wait 50 hours for a build again ; it was already painful on a real arm box (where it takes 90 minutes just to link libxul.so). Anyways, 2 patches stolen from upstream and 5 patches sent (or almost sent for the one currently under validation) later, we should be down to one release architecture failing instead of four. Which is already good. On the other hand, a new 3.5 upstream release, with security fixes, is planned for next tuesday, which means some time will have to be spent for stable updates, too. So, in the next few days, expect that I ll be working on stable security updates, then unstable updates, including the three architectures fix, and then work on 3.6 will continue. Which means we can hope for a 3.6 release in experimental by the end of next week, or the following one, in the worst case. Update: *sigh* 4 patches on arm is not enough :(. At least this time I think I m done with xptcinvoke and xptcstubs. Update:In the end, 2 patches and disabling the JIT compiler did the trick on arm. The 2 other patches were actually addressing bugs that only existed because the JIT is doing something wrong with the stack alignment.

Right now, your government is probably engaged in the discussion of the Anti-Counterfeiting Trade Agreement (ACTA). You are likely not aware of that because your government has been actively keeping these negotiations and details surrounding them secret. Your government does not want you to know about a treaty that has far-reaching negative effects on your freedom, as well as your basic human rights. If you did know, you might speak up and make it difficult for the drivers of ACTA to smoothly push their interests past you. The red light should light up in your head right now! The goals of the trade agreement that is being negotiated are multifarious, but essentially seem to centre around challenges related to intellectual property, and copyright in the digital age, even though it is sometimes claimed that the agreement serves primarily to contain trade of fake Prada bags and Rolex watches. In reality, ACTA is about content producers like movie studios, who try everything to prevent you from copying their work without paying for it even if you cannot actually purchase the work, because of e.g. technical measures designed to prevent certain people from legally obtaining content, or simply because the media companies are greedy and consider it PR-savvy to delay the release of a given work in certain countries until after people have had a chance to pay a lot of money to the cinemas. In theory, a creative work goes out of copyright 50 or 75 years after its author died, depending on whether the creativity can be attributed to a person or a corporation, respectively. Therefore, 50 or 75 years after creation, it gets increasingly hard to monetise a work that has not been reinvented in that period of time. Sounds plausible to you and me, but this sort of stuff frightens companies like Disney, who seem powerful enough to simply have the law changed. That is not how things should work. The media producers are failing to control the Internet, and hence they want to turn it into something more like cable TV, which they do know how to control. ACTA aims to make copyright infringement a criminal offence. ACTA wants to make it possible for a government to cut you off the Internet because someone thinks you did something bad they don t actually have to prove it though, accusation is enough. Similar efforts have already failed all over the world, e.g. in France and New Zealand. That s a sign, not a reason to try again. ACTA wants to set in stone that you have absolutely no rights when you cross borders. This is largely already the case border officials can pretty much do with you whatever they want now it s supposed to be made official, and legally binding. ACTA will create a culture of surveillance and suspicion. ACTA is designed to break the Internet, among other things. But worst of all: I am just speculating because we are not supposed to know the details. The best current source of information on ACTA seems to be Canadian law professor Dr. Michael Geist, who has been collecting content and linking to articles consistently since the ACTA negotiations commenced 2 3 years ago. The Electronic Frontier Foundation also has comprehensive resources available. It s even more important today than before to put an end to this secrecy. Don t let your government enter secret agreements that affect you and your life, refusing to talk to you about it beforehand, and probably refusing all responsibility afterwards. Talk to your politicians and ask questions that cannot be answered with stock replies. If you have specific contact addresses for politicians, please let me know so I can add them. Colin Jackson helped me with this article at Kiwi Foo Camp. He also takes an issue with the secrecy around ACTA.

If you know me a bit, you will probably be surprised to hear that I will cook a complete chicken (well, without the feathers) today, then remove all bones and add rice. It's for my lovely dog, who needs special food nowadays...

So Facebook Chat now uses XMPP. And the Empathy development version has some nice integration. This could mean that I can finally chat to non-Jabber using friends on a regular basis. It's been nearly four years since I switched from MSN to Jabber, and I think I lost contact with a lot of people. Facebook chat via AJAX is unreliable, and my visits to the site are quite irregular, so hopefully this will work around both problems. I for one welcome our social network monopoly overlords

So, we wanted to move a Hudson CI server at Canonical from using chroots to VM s (for better isolation and security), and there is this great product Ubuntu Enterprise Cloud (UEC basically Eucalyptus). To do this I needed to make some changes to the Hudson EC2 plugin and thats where the fun starts. While I focus on getting Hudson up and running with UEC in this post, folk generally interested in the differences between UEC and EC2, or getting a single-machine UEC instance up for testing should also find this useful. Firstly, getting a test UEC instance installed was a little tricky I only had one machine to deploy it on, and this is an unusual configuration. Nicely though, it all worked, once a few initial bugs and misconfiguration items got fixed up. I wrote up the crux of the outcome on the Ubuntu community help wiki. See 1 Physical system . The particular trap to watch out for seems to be that this configuration is not well tested, so the installation scripts have a hard time getting it right. I haven t tried to make it play nice with Network Manager in the loop, but I m pretty sure that that can be done via interface aliasing or something similar. Secondly I needed to find out what was different between EC2 and UEC (Note that I was running on Karmic (Ubuntu 9.10) so things could be different in Lucid). I couldn t find a simple description of this, so this list may be incomplete:

1. UEC runs an old version of the EC2 API. This is because it hasn t implemented everything in the new API versions yet.
2. UEC defaults to port 8773, not port 80 (for both the EC2 and S3 API s)
3. The EC2 and S3 API s are rooted differently: at AWS they are at /, for UEC they are at /services/Eucalyptus and /services/Walrus
4. UEC doesn t supply a SSL API port as far as I can tell.
5. DescribeImages has something wonky with it.

So the next step then is to modify the Hudson EC2 plugin to support these differences. Fortunately it is in Java, and the Java community has already updated the various libraries (jets3t and typica) to support UEC I just needed to write a UI for the differences and pass the info down the various code paths. Kohsuke has let me land this now even though it has an average UI (in rev 27366), and I m going to make the UI better now by consolidating all the little aspects into a couple of URL s. Folk comfortable with building their own .hpi can get this now by svn updating and rebuilding the ec2 plugin. We ve also filed another bug asking for a single API call to establish the endpoints, so that its even easier for users to set this up. Finally, and this isn t a UEC difference, I needed to modify the Hudson EC2 plugin to work with the ubuntu user rather than root, as Ubuntu AMI s ship with root disabled (as all Ubuntu installs do). I chose to have Hudson reenable root, rather than making everything work without root, because the current code paths assume they can scp things as root, so this was less disruptive. With all that done, its now possible to configure up a Hudson instance testing via UEC nodes. Here s how:

1. Install UEC and make sure you can run up instances using euca-run-instances, ssh into them and that networking works for you. Make sure you have installed at least one image (EMI aka AMI) to run tests on. I used the vanilla in-store UEC Karmic images.
2. Install Hudson and the EC2 plugin (you ll need to build your own until a new release (1.6) is made).
3. Go to /configure and near the bottom click on Add a new cloud and choose Amazon EC2.
4. Look in ~/.euca/eucarc, or in the zip file that the UEC admin web page lets you download, to get at your credentials. Fill in the Access Key and Secret Access key fields accordingly. You can put in the private key (UEC holds onto the public half) that you want to use, or (once the connection is fully setup) use the Generate Key button to have a dedicated Hudson key created. I like to use one that I can ssh into to look at a live node YMMV. (Or you could add a user and as many keys as you want in the init script more on that in a second).
5. Click on Advanced, this will give you a bunch of details like EC2 Endpoint hostname . Fill these out.
6. Sensible values for a default UEC install are: 8773 for both ports, /services/Eucalyptus and /services/Walrus for the base URLs, and SSL turned off. (Note that the online help tells you this as well).
7. Set an instance cap, unless you truely have unlimited machines. E.g. 5, to run 5 VMs at a time.
8. Click on Test Connection it should pretty much instantly say Success .
9. Thats the Cloud itself configured, now we configure VM s that Hudson is willing to start. Click on Add right above the List of AMIs to be launched as slaves text.
10. Fill out the AMI with your EMI e.g. emi-E027107D is the Ubuntu 9.10 image I used.
11. for remote FS root, just put /hudson or something, unless you have a preseeded area (e.g. with a shared bzr repo or something) inside your image.
12. For description describe the intent of the image e.g. DB test environment
13. For the labels put one or more tags that you will use to tell test jobs they should run on this instance. They can be the same as labels on physical machines it will act as an overflow buffer. If no physical machines exist, a VM will be spawned when needed. For testing I put euca
14. For the init script, its a little more complex. You need to configure up java so that hudson itself can run:

    cat >> /etc/apt/sources.list << EOF
    deb http://archive.ubuntu.com/ubuntu/ karmic multiverse
    deb http://archive.ubuntu.com/ubuntu/ karmic-updates multiverse
    deb http://archive.ubuntu.com/ubuntu/ karmic-security multiverse
    EOF
    export http_proxy=http://192.168.1.1:8080/
    export DEBIAN_FRONTEND=noninteractive
    apt-get update
    echo "buildd shared/accepted-sun-dlj-v1-1 boolean true"   debconf-set-selections
    apt-get install -y -f sun-java6-jre
    

    Note that I have included my local HTTP proxy there just remove that line if you don t have one.
15. Click on Advanced, to get at the less-common options.
16. For remote user, put ubuntu , and for root command prefix put sudo .
17. For number of executors, you are essentially choosing the number of CPU s that the instance will request. E.g. putting 20 will ask for an extra-large high-cpu model machine when it deploys. This will then show up as 20 workers on the same machine.
18. Click save
19. Now, when you add a job a new option in the job configuration will appear tie this job to a node . Select one of the label(s) you put in for the AMI, and running the job will cause that instance to start up if its not already available.

Note that Hudson will try to use java from s3 if you don t install it, but that won t work right for a few reasons I ll be filing an issue in the Hudson tracker about it, as thats a bit of unusual structure in the existing code that I m happier leaving well enough alone .

The news is out (link in Spanish). We will have this year the third edition of the DudesConf a.k.a. the Spanish DebConf. Special thanks to GPUL for hosting us another year!

Earlier today, I went to a local copy shop and had my diploma thesis printed. This afternoon, I will hand it in. The title is Loop subgroups of F_r and the images of their stabilizer subgroups in GL_r( ) and discusses a group-theoretical result. I assume that very few readers care about the content of the thesis, but maybe some are interested in a few assorted LaTeX hints. I m also publishing the full TeX source code, maybe someone can make use of it. Less chatty varioref I m using the varioref package, in conjunction with the cleveref package. This provides a command \vref fig:S3S4l which will expand to, for example, to Figure 1 on page 11 . But if the referenced figure is actually on the current page, the next page, the previous page or the facing page (in two-side layouts), it will say so: Figure 1 on this page. This is very nice, but I assume that the reader of my thesis is able to find Figure 1 when it is visible, i.e. on the current or facing page. One can remove the referencing texts with the commands \def\reftextfaceafter , \def\reftextfacebefore and \def\reftextcurrent . But because varioref puts a space between Figure 1 and this text, we will get a superfluous space even before punctuation. The remedy is the command \unskip, which removes this space again. So I use in my preamble:

\def\reftextfaceafter  \unskip %
\def\reftextfacebefore \unskip %
\def\reftextcurrent    \unskip %

Palatino and extra leading I chose the Palatino font for my thesis, using the mathpazo package. Various sources (such as the KOMA-Script manual) suggest to use 5% extra leading:

\linespread 1.05 

Counting figures independently from chapters I don t have too many figures and tables in my thesis, and I want them to be numbered simple 1, 2, ... By default, LaTeX would say 1.1, 1.2, 2.1, ... This can be fixed using the remreset package and these commands:

\makeatletter
\@removefromreset figure chapter 
\renewcommand \thefigure \arabic figure 
\@removefromreset table chapter 
\renewcommand \thetable \arabic table 
\makeatother

No widows and club lines LaTeX already avoids these, but I wanted to get rid of them completely. This can be done with:

% Disable single lines at the start of a paragraph (Schusterjungen)
\clubpenalty = 10000
% Disable single lines at the end of a paragraph (Hurenkinder)
\widowpenalty = 10000 \displaywidowpenalty = 1000

Struck table lines I had to typeset tables with some lines struck, and I could not find a ready command for that. I used the following definition, based on the code for \hline. Note that it probably does not adjust well to other font sizes and needs to be adjusted manually:

\makeatletter
\def\stline %
  \noalign \vskip-.7em\vskip-\arrayrulewidth\hrule \@height \arrayrulewidth\vskip.7em 
\makeatother

Title page in one-sided layout According to the KOMA manual, the title page as set by LaTeX is not meant to be the cover of a publication, and therefore has to be set with the margins of a right page i.e. a larger right margin and a smaller left margin. But when printing cheaply, one often just put a transparent sheet on top of the print, so the title page is the cover. You can convince KOMA that you are right by using

\KOMAoptions twoside=false 
\begin titlepage 
...
\end titlepage 
\KOMAoptions twoside=true 

Not flushing the page for chapter heads LaTeX would put the list of algorithms on a new right page. I found this a waste of paper for my few algorithms, and preferred to put the list right after the table of contents. You can override the LaTeX behavior using:

\tableofcontents
 
\let\cleardoublepage\relax  % book
\let\clearpage\relax  % report
\let\chapter\section
\listofalgorithms
 

This code also reduces the size of the heading to that of a section. The same trick also works with \chapter. Math in headings vs. PDF bookmarks LaTeX with the hyperref package creates nice PDF bookmarks from your chapter and section titles. Unfortunately, PDF bookmark names can only be plain strings, while the titles in the document might contain some math symbols. You can make both happy with \texorpdfstring:

\section Stabilizer subgroups in \texorpdfstring $\GL_r(\Z/2\Z)$ GL\_r(Z/2Z) 

Setting lines for the signature The diploma thesis contains a small note which I have to sign, saying that I created it on my own etc. Below that, I put two labeled lines for date and signature, using the tabbing environment:

\begin tabbing 
\rule 4cm .4pt \hspace 1cm  \= \rule 7cm .4pt  \\
Ort, Datum \> Unterschrift
\end tabbing 

Back in the Lenny release cycle, I published some statistics of the release critical bugs. As we are (try to) get nearer to a freeze of Squeeze I think it's time to start that again. But first, a small explanation follows, what these numbers actually mean. If you look at our official bug tracking system currently lists 750 release critical bugs affecting the next stable release. While this number is kind of true, it is not accurate to use it to measure the state of the release. The unofficial rc bug thingy at bts.turmzimmer.net is quite more powerful to actual get some interesting numbers, as you can ignore specific kinds of bug and filter them properly. Note, that at the very end of the detailed list of the bugs you get the total number. With that interface you can for example filter them by different distributions. For example it currently lists 650 rc bugs in total for any distribution, but if you filter for squeeze bugs, you get only 518. That's a different number as the official bug tracker shows; I'm not entirely sure why, but a part of that difference is that both the official and the unofficial web pages are only synced periodically. Should someone be able to give a good explanation about the differences, please step forward ;) But let's play more: You can filter for bugs valid in squeeze-only, but not in sid. These bugs are already fixed in sid, but the packages haven't yet migrated to squeeze. Currently that are 94 bugs. We can furthermore ignore bugs only in sid; when squeeze is unaffected, we just don't migrate the broken package from sid to squeeze. The number that is most interesting for contributors is the number of bugs affecting both, sid and squeeze, as these are the ones which really need to be fixed as no fix is known, yet. So filtering for bugs for both we are down to 424 at the moment. But of these 424 remaining release critical bugs, we can still ignore some (for now). For example bugs concerning packages in non-free or contrib (9 currently) won't stop us from release, will they? There are also many bugs marked as pending (32), meaning that the maintainer is aware of the bug has a fix prepared and is just waiting with the upload a moment. Some of this bugs have already a patch (64), but no one reviewed it and uploaded it by now. You'll also see that you can ignore merged bug reports (47). That are bug reports reporting the very same bug several times. Finally there are bug fixes already uploaded to the so called delayed queue (6). This are bug fixes which where uploaded by someone else than the real maintainer, but to give the maintainer a chance to act on himself or to comment, the upload is delayed by some days before it will actually hit the archive. Currently 6 bugs are fixed by uploads to delayed. 17 bugs are claimed meaning that someone already said he will take care of this bug (but they are not finished, yet). You could also ignore the bugs invalidated by today's britney bug category, representing bugs which will vanish after the next migration of packages from sid to freeze, but as we are only looking at rc bugs in both sid and squeeze, this number will always 0 ;) That leaves bugs somehow other marked as fixed which are bugs (39) where I honestly have no Idea what they are... If someone can explain them, please do so ;) Here is a small tabular showing the above numbers:

Total:	650
Affecting Squeeze:	518
Squeeze-only:	94
Unfixed bugs remaining in Squeeze:	424

Of these 424 bugs...

... are pending	32
... are patched:	64
... are duplicates:	47
... are in Non-free or contrib:	9
... are claimed by someone:	17
... are fixed in the delayed queue:	6
... are somehow marked as fixed:	39

Or in other words:
Release critical bugs left in squeeze, when ignoring all these:
260 That's a pretty number, isn't it? There are only 260 bugs left which need our immediate attention :) But that is a rather optimistic view of the situation. We e.g. assume that all bugs having a patch are really fixed by the patch. We also ignored, that some bugs in squeeze are already fixed in sid, but the package can't migrate because the package in sid contains a new bug. (Which happens to release wizard Marc Brockschmidt quite often.) So if we take off the purple classes and take a more pessimistic view (release mangers must be pessimists to ensure high quality packages ;) we count the bugs in squeeze and ignore only those bugs, which are:

• hinted / delayed upload (hint means a package is forcefully migrated from sid to squeeze without waiting the usual time span)
• merged
• contrib
• non-free
• bugs invalidated by today's britney (fixed in sid, package will migrate soon)

With this release managers views, 424 bugs remain to be fixed somehow before we can release. As far as I know, we can freeze once that number is reliable under 300. So we better get working ;) When asked, what is the thing mostly needed to help the release, I was told: mips porter!
As you might have read we have some problems with the mips and mipsel architectures. It seems we have all the hardware we need, but it doesn't work very reliable. I have been told, that over 300 packages are only waiting to be build on mips* architectures. So if you can help us in that regard, please contact our mips porter mailing list. Update: Andreas Barth just told me, that he already send a couple of mails to the mips list describing the problem and asking questions. Answers to these questions would be most welcome and accpeted gladly.