Check out the new SourceForge HTML5 internet speed test! No Flash necessary and runs on all devices. ×

Sunstone Unearthed From Sixteenth Century Shipwreck 114

sciencehabit writes "In 1592, a British ship sank near the island of Alderney in the English Channel carrying an odd piece of cargo: a small, angular crystal. Once it was brought back to land, a few European scientists began to suspect the mysterious object might be a calcite crystal, a powerful 'sunstone' referred to in Norse legends which they believe Vikings and other European seafarers used to navigate before the introduction of the magnetic compass. Now, after subjecting the object to a battery of mechanical and chemical tests, the team has determined that the Alderman crystal is indeed a calcite and, therefore, could have been the ship's optical compass. Today, similar calcite crystals are used by astronomers to analyze the atmospheres of exoplanets—perhaps setting the stage for a whole new age of exploration."

Protecting the Solar System From Contamination 121

tcd004 writes "An article at PBS begins, 'Imagine this crazy scenario: A space vehicle we've sent to a distant planet to search for life touches down in an icy area. The heat from the spacecraft's internal power system warms the ice, and water forms below the landing gear of the craft. And on the landing gear is something found on every surface on planet Earth... bacteria. Lots of them. If those spore-forming bacteria found themselves in a moist environment with a temperature range they could tolerate, they might just make themselves at home and thrive and then, well... the extraterrestrial life that we'd been searching for might just turn out to be Earth life we introduced.' The article goes on to talk about NASA's efforts to prevent situations like this. It's a job for the Office of Planetary Protection. They give some examples, including the procedure for sterilizing the Curiosity Rover: 'Pieces of equipment that could tolerate high heat were subjected to temperatures of 230 to 295 degrees Fahrenheit for up to 144 hours. And surfaces were wiped down with alcohol and tested regularly.'"

Salt Linked To Autoimmune Diseases 308

ananyo writes "The incidence of autoimmune diseases, such as multiple sclerosis and type 1 diabetes, has spiked in developed countries in recent decades. In three studies published today, researchers describe the molecular pathways that can lead to autoimmune disease and identify one possible culprit that has been right under our noses — and on our tables — the entire time: salt. Some forms of autoimmunity have been linked to overproduction of TH17 cells, a type of helper T cell that produces an inflammatory protein called interleukin-17. Now scientists have found sodium chloride turns on the production of these cells (abstract). They also showed that in a mouse model of multiple sclerosis, a high-salt diet accelerated the disease's progression (abstract)."

For ESA's Herschel Mission, the End Is Near 40

Trapezium Artist writes "The European Space Agency's far-infrared space observatory, Herschel, will soon run out of its liquid helium coolant, ending observations after more than three years of highly successful scientific operations. Predictions by ESA engineers are that Herschel will run out of helium later in March, at which point its instruments will warm up, rendering them effectively blind. Herschel was launched in 2009 along with ESA's Planck satellite to the Sun-Earth L2 point, roughly 1.5 million kilometers from Earth. At that location, the Sun and Earth remain along a more or less constant vector with respect to a spacecraft, meaning that it can cool to very low temperatures behind a sunshield. At such a large distance from Earth, however, there is no way of replenishing the coolant, and Herschel will be pushed off the L2 point to spend its retirement in a normal heliocentric orbit. With the largest monolithic mirror ever flown in space at 3.5 meters diameter and three powerful scientific instruments, Herschel has made exciting discoveries about the cool Universe, ranging from dusty starburst galaxies at high redshifts to star-forming regions spread throughout the Milky Way and proto-planetary disks of gas and dust swirling around nearby young stars. And with an archive full of data, much of it already public, Herschel is set to produce new results for years to come."

When Will We Trust Robots? 216

Kittenman writes "The BBC magazine has an article on human trust of robots. 'As manufacturers get ready to market robots for the home it has become essential for them to overcome the public's suspicion of them. But designing a robot that is fun to be with — as well as useful and safe — is quite difficult.' The article cites a poll done on Facebook over the 'best face' design for a robot that would be trusted. But we still distrust them in general. 'Eighty-eight per cent of respondents [to a different survey] agreed with the statement that robots are "necessary as they can do jobs that are too hard or dangerous for people," such as space exploration, warfare and manufacturing. But 60% thought that robots had no place in the care of children, elderly people and those with disabilities.' We distrust the robots because of the uncanny valley — or, as the article puts it, that they look unwell (or like corpses) and do not behave as expected. So, at what point will you trust robots for more personal tasks? How about one with the 'trusting face'?" It seems much more likely that a company will figure out sneaky ways to make us trust robots than make robots that much more trustworthy.

Slashdot Top Deals