Cody Taylor

Red Flayer writes “Popular Mechanics is running a story that describes one of the more interesting explanations for the Tunguska explosion of 1908: ‘Now, a controversial new scientific study suggests that a chunk of a comet caused the 5-10 megaton fireball, bouncing off the atmosphere and back into orbit around the sun. The scientists have even identified a candidate Tunguska object — now more than 100 million miles away — that will pass close to Earth again in 2045.’ Note that Popular Mechanics’ definition of ‘close to’ is somewhat different than most people’s — the comet will be 3.8 million miles away at its closest. At any rate, the key to this theory is that hydrogen and oxygen in the ice shard exploded upon entering the atmosphere, resulting in the difficult-to-explain blast pattern (previous theories contend that the object must have ‘skipped’ on the atmosphere and then re-entered at the exact same spot). This would also, sadly, dash the theory that Nikola Tesla was responsible.”

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KentuckyFC writes “Warp drives were generally considered impossible by mainstream scientists until 1994 when the physicist Michael Alcubierre worked out how to build a faster-than-light drive using the principles of general relativity. His thinking was that while relativity prevents faster-than-light travel relative to the fabric of spacetime, it places no restriction on the speed at which regions of spacetime may move relative to each other. So a small bubble of spacetime containing a spacecraft could travel faster than the speed of light, at least in principle. But one unanswered question was what happens to the bubble when quantum mechanics is taken into account. Now, a team of physicists have worked it out, and it’s bad news: the bubble becomes unstable at superluminal speeds, making warp drives impossible (probably).”

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TechCrunch is running a story about three possible security issues with Google Docs recently uncovered by researcher Ade Barkah. It turns out that an image embedded into a protected document is given a URL which is not protected, allowing anyone who knows or guesses it to see the image regardless of permissions or even the existence of the document. Barkah also pointed out that once you’ve shared a document with another person, that person can see diagram revisions from any point before they gained access, forcing you to create a new document if you need to redact something. The last issue, the mechanics of which he disclosed only to Google, affects the document-sharing invitation forwarding system, which can allow somebody access to your documents after you’ve removed their permissions. Google made a blog post to respond to these concerns, saying that they “do not pose a significant security risk,” but are being investigated. We previously discussed a sharing bug in Google Docs that was fixed earlier this month.

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snahgle writes “Mathematicians John Conway (inventor of the Game of Life) and Simon Kochen of Princeton University have proven that if human experimenters demonstrate ‘free will’ in choosing what measurements to take on a particle, then the axioms of quantum mechanics require that the free will property be available to the particles measured, or to the universe as a whole. Conway is giving a series of lectures on the ‘Free Will Theorem’ and its ramifications over the next month at Princeton. A followup article strengthening the theory (PDF) was published last month in Notices of the AMS.” Update: 03/19 14:20 GMT by KD : jamie points out that we discussed this theorem last year, before the paper had been published.

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longacre writes “Modern highway planning schemes designed to make roads safer combined with the comfort and safety technology found in the modern automobile may actually be putting us in danger, according to a compelling piece in Popular Mechanics. Citing studies and anecdotal evidence, the article points out that a driver on a narrow mountain road will probably drive as if their life depends on it; but the same driver on an eight-lane freeway with gradual curves and little traffic may be lulled into speeding while chatting on his cellphone. Quoting: ‘Modern cars are quiet, powerful and capable of astonishing grip in curves, even on wet pavement. That’s swell, of course, until you suddenly lose traction at 75 mph. The sense of confidence bred by all this capability makes us feel safe, which causes us to drive faster than we probably should. We don’t want to make cars with poor response, but perhaps we could design cues — steering-wheel vibration devices, as in video games? — that make us feel less safe at speed and encourage more care. … In college I drove an Austin-Healey 3000 that somehow felt faster at 45 mph than my Mazda RX-8 (or even my Toyota Highlander Hybrid) feels at 75 mph. That was a good thing.'”

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M3rk sends an excerpt from an opinion piece on Gametopius discussing what it takes for an open game world to be successful. Interesting stories and characters are important, but they must be balanced by varied and entertaining gameplay. The lack of either will be a limiting factor in how many people return to play once the primary plot is completed. Quoting: “A game like GTA IV takes itself and its fiction very seriously. It spends a lot of time, effort, and gameplay resources convincing you that the world you are traveling through is the same world that the story and cutscenes take place in. It may not be a game that allows you to own or control property to the degree seen in Burnout Paradise or Saints Row II, but it wants its world to be cohesive, not divided. … While GTA IV’s game systems almost serve its plot, Saints Row II and Burnout Paradise live for their game mechanics. Sure, these worlds are fun to look at and explore, but any exploration and discovery that the player enjoys merely drives them to these games’ raison d’être: fun systems to play with.”

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ZosX writes “An article over at Popular Mechanics announces that, for the first time, solar cells have been manufactured for the much sought-after figure of /Watt. They also talk about a new study of the cost of the particular raw materials used in different manufacturing processes. The conclusion is that the company that just achieved the /W milestone, using cadmium telluride technology, may not prove to be the long-term winner capable of meeting demand when it rises into the terawatt range.”

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bughunter writes “The Orbiting Carbon Observatory (OCO) is slated for launch tomorrow, February 24, 2009. OCO is the first earth science observatory that will create a detailed map of atmospheric carbon dioxide sources and sinks around the globe. And not a moment too soon. Popular Mechanics has a concise article on the science that this mission will perform, and how it fits in with the existing ‘A-train’ of polar-orbiting earth observatories. JPL’s page goes into more detail. And NASA’s OCO Launch Blog will have continuous updates as liftoff approaches and the spacecraft reports in and checks out from 700km up.”

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bughunter writes “The Orbiting Carbon Observatory (OCO) is slated for launch tomorrow, February 24, 2009. OCO is the first earth science observatory that will create a detailed map of atmospheric carbon dioxide sources and sinks around the globe. And not a moment too late. Popular Mechanics has a concise article on the science that this mission will perform, and how it fits in with the existing ‘A-train’ of polar-orbiting earth observatories. JPL’s page goes into more detail. And NASA’s OCO Launch Blog will have continuous updates as liftoff approaches and the spacecraft reports in and checks out from 700km up.”

Read more of this story at Slashdot.