Cap'n Refsmmat

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Everything posted by Cap'n Refsmmat

  1. Forum Debate

    What kind of format and topics are you thinking of? We did indeed have debates years ago, but scheduling them, picking a good format, and getting participants is a fair amount of work, and the right format is important to make the debates work.
  2. So. If you were in charge, what would you change about the new ScienceForums.Net?
  3. What are you reading?

    What books are you reading now? Doesn't matter what kind, what subject, whatever. It'll just be fun to see what everyone's reading. I'd certainly like to get more reading material in. I'll start: I'm currently starting The Blind Watchmaker, by Richard Dawkins, as I'm currently writing a report discussing evolution and I spotted it in the library while doing research.
  4. What science books do you recommend?

    Let's start a list of the popular (and unpopular) science books you recommend. Perhaps we can all get some worthwhile reading material out of this. I'll start: Fabric of the Cosmos by Brian Greene: good intro to modern physics Anatomy of an Epidemic by Robert Whitaker: a look at modern psychopharmacology and the effects of psychiatric medicine. Well-written and researched. Why People Believe Weird Things, by Michael Shermer. Engaging, amusing, and enlightening. The Last Man on the Moon, by Gene Cernan. Cernan landed on the Moon on Apollo 17, and this book is his memoir of the entire Gemini, Mercury and Apollo programs. Great if you like space exploration. What are your choices?
  5. Recommended Philosophical Reading

    I'm sure there are some members here with their favorite philosophical writings. Let's make a sort of reading list, shall we? So, what kinds of philosophical books do you like?
  6. Recommended Religious Reading

    Let's start up a reading list of recommended books about religion. So, what books have you read have been thought-provoking, influential, or just downright interesting? I'll start. The New Oxford Annotated Bible. I'm not done yet, but the annotations are very helpful and there are collections of explanatory essays and introductions to give background material about the theology and history involved. Lost Christianities, by Bart Ehrman. An interesting introduction into the early variants of Christianity that didn't survive to modern times. The variety is fascinating.
  7. Welcome to the upgraded SFN

    Hi everyone, We've upgraded SFN to version 4.1 of our forum software, and things are looking good so far. Take a look around and enjoy the new features, and post here if you experience any weird problems. Some things to note: You may enjoy the new Activity stream, showing everything that's happening on SFN in real time (the page automatically updates). There are some minor updates to the LaTeX rendering we now use, which are detailed in an updated thread in the maths forums. The search system and "Unread Content" button may not work correctly for a day or so -- the system has to reindex all the posts and topics, so search results won't be correct. There's no longer a difference between "Display Name" and "Login Name", so if you logged in with a different name than was shown on the forums, you need to switch to logging in with the display name. The new site should look and feel much better on phones and tablets. There are more new features than I can describe here, but hopefully being on the latest supported version will reduce spam, improve security, and eliminate old bugs. Possibly while creating new ones. We'll see. Many thanks to Klaynos for the upgraded SFN logo, tweaked for the new look.
  8. In the United States, a lot of police and fire radio systems operate in the 800 MHz band, which has sections reserved for public safety use. https://www.fcc.gov/general/800-mhz-spectrum
  9. Current events

    What types of topics or discussions do you think would belong in such a section that wouldn't be covered by the Politics section?
  10. Infection

    Could you be specific about the error message and any details it provides? Oddly enough, Googling "Googleheads" doesn't turn up any information that would help me track this down.
  11. Referring to posts in threads

    If you click the "Share this post" button at the top right corner of a post (the three dots linked by two lines), you'll get a direct link to the post, which you could use to refer to a specific post.
  12. IPB is Invision Power Board, the old name for the software we use. (Eventually they rebranded as Invision Community or something.) There are two separate problems we're experiencing: The new version of IPB was saving a bunch of cache data to the hard disk with every request, causing enormous load on the hard drives. That seems to be part of why SFN was so slow -- every request was delayed waiting for its turn to use the hard disk. Dave switched it to use the database instead, which can be much smarter about keeping the data in memory instead of on disk. The "bad gateway" errors are a bug in PHP which make it crash occasionally. Our HTTP server, nginx, notices that PHP has crashed and failed to produce a webpage, and reports "bad gateway" to you. If Dave's tweak is right, it should fix problem #1 but not problem #2. I've searched for solutions to problem #2 and haven't found anything yet -- either we're the only people experiencing the problem or it's an artifact of something unique in our setup. But if you encounter the "bad gateway" errors you should be able to refresh and get the page loaded quickly. We'll monitor the changes over the next couple days and see if problem #1 is conclusively solved or if we need to make more tweaks. Big thanks to Dave for spotting the issue and fixing it.
  13. Was it this page? http://www.scienceforums.net/online/ You get that by hitting "See full list" on the Who's Online box.
  14. Your Heart's Desire

    Their excuse is that post counts can vary. Moderators can see posts that were hidden for breaking the rules; posts may be deleted after members already referred to them by number; and posts may be in the mod queue awaiting approval. I could refer to post #48, but its number may be different by the time you look at it, because post #47 was deleted. I suppose every post could be assigned a permanent number, displayed at the top right, and if #47 is deleted the thread simply skips from 46 to 48, but then you could see when we delete things, and the more censorious forums would get upset that their members could see behind the curtain.
  15. Your Heart's Desire

    The makers of our forum software believe they know better than we do, and don't intend to create an option for adding back post numbers. This is one of the many reasons why I hate all forum software. However, if you click the little Share icon at the top right of a post, you can get a direct link to the post, which you can use to send people directly to the post you're referring to.
  16. The advertisements (Google AdSense) should be asynchronous: waiting for the ads to load should never block the rest of the page from loading. I believe the ads do make periodic requests while a page is open, though, so if you're waiting for another page to load you may see some ad requests appearing in the mean time.
  17. Yeah, I was trying to debug things further and screwed up for a while. Sorry about that. Should be running fine now, though I'm still puzzled by the high latency.
  18. Just made another tweak: allowed nginx (the web server software) to use 16 processes instead of just 4, since we do have 16 cores available on the server. Perhaps that will decrease some of the latency we've been seeing, where it takes multiple seconds before the server even replies to a request.
  19. I just killed some idle processes on the server and upped the PHP opcode cache memory limit to 128MB instead of 64MB (it was full). Both should help a bit. I'll check in again tomorrow to see if the memory limit is adequate and see if there's anything more I can do.
  20. Yeah, there's a PHP bug that makes it crash occasionally, and you get a 502 when that happens. It seems to happen every few minutes, and one random person trying to load a page when it happens is the lucky winner. I wasn't able to find any bug reports that matched the crash, but I did just upgrade our PHP install, and will watch to see if that fixes it. Backups just ran and sucked up a lot of CPU. Also I was running the upgrades. Let's see how the next day or so goes and that'll tell us if it's fixed.
  21. It looks like we were getting bursts of traffic faster than we could start PHP processes, and didn't have enough spare processes. I bumped the maximum number of spare processes up to 25 (from 10) and the overall cap up to 50. I'm not sure if that will solve the entire problem, but it should prevent some of the Bad Gateway errors. Let me know what you experience over the next day or so.
  22. I'll look into this soon. We had problems soon after the upgrade, which we were able to fix, but I'm not sure what could be making the site slow now.
  23. Allowing users to edit HTML directly is a serious security risk, unfortunately, since you could easily embed all kinds of things in posts (like JavaScript with redirects to malware sites). Is there something specific you're trying to do that you can't do in the regular editor?
  24. Smuggling Nuclear Weapons

    Yes, a fission bomb would be a lot more difficult than, say, stealing some cobalt-60 out of a weakly secured hospital and putting it in an improvised dirty bomb. The radiation wouldn't be a serious hazard, but the panic and fear would be. I recall reading a GAO report about the security of medical radioactive sources in the US, and it was terrifying. They found large sources "locked" in rooms with the key code Sharpied on the door frame or stored in rooms with a window overlooking a handy loading dock... and it's not uncommon for industrial sources to be stolen out of trucks or off job sites, mostly by people who don't know what they are and just steal anything that looks valuable.
  25. Smuggling Nuclear Weapons

    Uranium and plutonium, the major components in a fission bomb, are not strong gamma emitters; I think they're mostly alpha and neutron emitters, and alpha particles are easily stopped in air or by solid materials, while neutrons are just hard to detect in general. Nuclear bombs are actually surprisingly hard to detect from a distance. I actually worked on a project to detect changes in gamma radiation indicating a radioactive material has been smuggled into an area. It's mostly good for industrial radioactive sources (which are often used for radiography or for sensing at the bottom of oil wells) or medical sources, like iodine-131. Many of these are poorly secured and could easily be stolen and turned into a dirty bomb. With gamma spectrometers regularly patrolling a city, you'd be able to detect an unshielded industrial source at a reasonable distance (under a mile). Many border crossings do have portal radiation monitors which trucks (or shipping containers) go through before entry. Mostly these can detect gamma emitters. Apparently more recent ones can detect the neutrons emitted by fissile material, although I suspect that's still very difficult. I am not aware of any major cities with systematic radiation detection systems. RadNet air monitors would detect materials released into the atmosphere, but not sealed sources, unless they get particularly close to a detector. A few cities have police carrying personal radiation detectors like this one, which I got to use a couple times, and a few other cities have done detailed helicopter-borne radiation surveys to map their background radiation. But systematic anomaly detection is too expensive outside of nuclear installations. According to a book I'm reading now (Raven Rock by Garrett Graff, page 104), Hugh Sidey's account is in a Time article from 2001. So apparently it could have already happened?