By Soulskill from Slashdot's how's-that-space-program-coming-along department
New submitter citadrianne
sends a story about the beginnings of our asteroid defense efforts, and how initial concern over an asteroid strike wasn't sustained long enough to establish consistent funding: Until a few decades ago, the powers that be didn't take the threat of asteroids very seriously. This changed on March 23, 1989, when an asteroid 300 meters in diameter called 1989FC passed within half a million miles of Earth. As the New York Times put it, "In cosmic terms, it was a close call." After this arguably close brush with total annihilation, Congress asked NASA to prepare a report on the threat posed by asteroids. The 1992 document, "The Spaceguard Survey: Report of the NASA International Near-Earth-Object Detection Workshop," was, suffice it to say, rather bleak.
If a large NEO were to hit Earth, the report said, its denizens could look forward to acid rain, firestorms, and an impact winter induced by dust being thrown miles into the stratosphere. ... After reports from the National Research Council made it clear that meeting the discovery requirement outlined in the Congressional mandate was impossible given the lack of program funding, NEOO got a tenfold budget increase from 2009 to 2014. Yet it still faces a number of difficulties. A program audit released last September described the NEOO program as a one-man operation that is poorly integrated and lacking in objectives and oversight.Read Replies (0)
By timothy from Slashdot's can't-find-your-bags-at-all-sir department
The BBC reports that Solar Impulse has resumed its 'round-the-world attempt
, having taken off today from Nagoya, Japan for what is intended to be a 120-hour voyage to Hawaii. [If pilot Andre Borschberg] succeeds, it will be the longest-duration solo flight in aviation history, as well as the furthest distance flown by a craft that is powered only by the Sun. The Pacific crossing is the eighth leg of Solar Impulse's journey around the world.
But this stage has proven to be the most difficult, and has been hit by weeks of delays."
The circumnavigation attempt began earlier this year
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By timothy from Slashdot's endless-dollhouse-furniture department
An anonymous reader writes: I've been thinking about getting a 3-D printer for a while: the quality is rising, the software is better, STL files really do seem a sufficiently good standard ("sufficiently standard," that is — I'm not worried that printers are going to stop supporting it anytime soon), and prices have dropped quite a bit. Importantly to me, it also seems like less of a jumping-off-a-cliff decision, since I can get a completely assembled one from places as wild and crazy as ... the Home Depot (not that I plan to). However, even the stretchiest practical things I can think of to print can't truly actually justify the price, and that's OK — I hope not to require enough replacement knobs and chess pieces to necessarily *need* one, and playing around with it is the main likely upshot, which I'm OK with. But still, I'd like to hear what uses you have been putting your 3-D printer to, including printers that aren't yours but belong to a hackerspace, public library, eccentric neighbor, etc. What actually practical / useful tasks have you been using 3-D printing for, and with what printer technology? What playful purposes? It's OK if you just keep printing out those chess pieces and teapots, but I'm curious about less obvious reasons to have one around. (And I might just use the local Tech Shop's anyhow, but the question still applies.) If you've purchased a 3D printer, are you happy with the experience? If so, or if not, what kind did you get?Read Replies (0)
By timothy from Slashdot's don't-worry-phone-makers-will-keep-up department
The Korea Times reports that Samsung researchers have published in Nature Communications
the results of research (here's the abstract
) that could lead to vastly greater storage capacity
for lithium-ion batteries. The researchers, by growing graphene on silicon anodes, were able to preserve the shape of the anodes, an outcome which has formerly eluded battery designers: silicon tends to deform over numerous charging cycles. From the linked abstract: Here we report direct graphene growth over silicon nanoparticles without silicon carbide formation. The graphene layers anchored onto the silicon surface accommodate the volume expansion of silicon via a sliding process between adjacent graphene layers. When paired with a commercial lithium cobalt oxide cathode, the silicon carbide-free graphene coating allows the full cell to reach volumetric energy densities of 972 and 700Whl1 at first and 200th cycle, respectively, 1.8 and 1.5 times higher than those of current commercial lithium-ion batteries. Also at ZDNet
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By timothy from Slashdot's how-do-you-feel-about-me-being-eliza department
writes: According to a WSJ article titled "Artificial Intelligence machine gets testy with programmer," a Google computer program using a database of movie scripts supposedly "lashed out" at a human researcher who was repeatedly asking it to explain morality. After several apparent attempts to politely fend off the researcher, the AI ends the conversation with "I'm not in the mood for a philosophical debate." This, says the WSJ, illustrates how Google scientists are "teaching computers to mimic some of the ways a human brain works."
As any AI researcher can tell you, this is utter nonsense. Humans have no idea how the human, or any other brain, works, so we can hardly teach a machine how brains work. At best, Google is programming (not teaching) a computer to mimic the conversation of humans under highly constrained circumstances. And the methods used have nothing to do with true cognition.
AI hype to the public has gotten progressively more strident in recent years, misleading lay people into believing researchers are much further along than they really are — by orders of magnitude. I'd love to see legitimate A.I. researchers condemn this kind of hucksterism.Read Replies (0)