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« Science: July 2016 | Main | Science: September 2016 » ScienceThe Sub-Mariner's Not Going to Like This But these are uncharted waters, says Cindy van Dover, director of the Duke University Marine Laboratory in Beaufort, N.C. "We do not know where the tipping points are with regard to how much damage deep-sea systems can sustain and still maintain the health of the ocean," she says. To collect this treasure Nautilus has designed a trio of huge, remote-controlled underwater machines that would not look out of place in a Terminator movie. Two "cutters"--weighing 308 and 250 metric tons, respectively--will crawl across the seafloor on tank treads and grind the ore into slurry using spinning toothed wheels. A 2,200-metric-ton collecting machine will feed the slurry into an enclosed pumping system to the surface. Operators in a support vessel control the cutters and collecting machine using joysticks, sonar and live streaming video. Onboard the support vessel the slurry will be drained and transferred to another ship for processing in China. The wastewater will be filtered of impurities and pumped back down to the seafloor. ... Richard Steiner, a conservation biologist and former University of Alaska professor who is not involved in the Solwara project, is unconvinced. "There's no question this will pose massive environmental impacts," he says--from bright lights, noise and potential toxic leaks to sediment plumes that could clog the filters many kinds of sea life use for feeding. The deep ocean is the largest and least understood biological habitat on Earth and deep-sea vents--discovered as recently as 1977--may be one of the rarest of all ecosystems, says Steiner, who heads up the conservation consultancy Oasis Earth. Only about 300 vent sites are known and estimates of the total number that exists range between 500 and 5,000. Impact reports that use land-based mines as a benchmark are comparing apples and oranges, Steiner says--and our environmental track record in deepwater oil and gas recovery is not exactly inspiring. The deep ocean is unforgiving, even to experts; in 2014 Woods Hole's Nereus robotic sub imploded in the Kermadec Trench, a 10-kilometer-deep rut in the Pacific Ocean floor where two tectonic plates meet northeast of New Zealand. "There's a dangerous combination of ignorance, arrogance, greed and very poor scientific understanding," Steiner says. "Humans are terrestrial primates; we just don't get underwater." As seen with fracking, we are experts at pulling things out of the ground and then pumping water back into the holes without incurring horrible consequences. And it's all totally contained. No worries. What are the chances anything could leak out? By min | August 11, 2016, 8:43 AM | Science | Link What the hell does that mean? Physicists seem to think they can just casually throw that out there as if it explains something. Under those conditions Turok and Gielen found that the contracting universe would never actually become a singularity--essentially it would "tunnel through" the worrisome point by hopping from a state right before it to a state right after it. Although such sidestepping sounds like cheating, it is a proved phenomenon in quantum mechanics. Because particles do not exist in absolute states but rather hazes of probability there is a small but real chance they can "tunnel" through physical barriers to reach locations seemingly off-limits to them--the equivalent, on a microscopic scale, of walking through walls. "The fuzziness in space and time and the matter conspires to make it uncertain where the universe is at a given time," Turok explains. "This allows the universe to pass through the singularity." They're talking about the fuzziness of space and time and matter. And this somehow makes it possible to just skip over that annoying part of the calculation that can't be solved. It totally sounds like cheating. Although, most of quantum physics sounds like cheating to me, so shows what i know. Of lesser fantasticness to me is the main thrust of the article which is the theory that the universe didn't start with a bang, but initially contracted before expanding out. But an underdog idea posits that the birth of this universe was not actually the beginning--that an earlier version of spacetime had existed and contracted toward a "big crunch," then flipped and started expanding into what we see today. Now a new study suggesting a twist on this "bounce" scenario has supporters excited and inflation proponents newly inflamed over a "rival" they say they have repeatedly disproved, only to have it keep bouncing back. By min | August 3, 2016, 9:15 AM | Science | Link Height is still increasing in some Latin American and southern European countries but it has plateaued in many other places in the last few decades. North America was the first to stop growing, around 30 or 40 years ago, and the U.S. has experienced the smallest increase of any high-income country (five centimeters for women, six centimeters for men). Other countries that have leveled off include the U.K. and Japan. Arggh! The metric system! Theoretically, i can picture a centimeter in my mind, but once i start having to compare lengths, forget it. The team compared changes in height with changes in risk of dying between ages 50 to 70, finding that countries that had grown most tended to have declined most in risk of premature death. "In the case of men, countries that gained 10 to 12 centimeters in height had about [a] 20 to 30 percent decline in risk of premature dying," Ezzati said. "Slightly smaller for women, about 10 to 20 percent, but those are big changes." By min | August 2, 2016, 8:53 AM | Science | Link |