Native small mammals on forest islands created by a large hydroelectric reservoir in Thailand faced extinction and a new paper says species living in rainforest fragments could be far more likely to disappear than was previously thought.

The authors draw parallels between logging and the islands created by hydroelectric power and say they were motivated by a desire to understand how long species can live in forest fragments. If they persist for many decades, this gives conservationists a window of time to create wildlife corridors or restore surrounding forests to reduce the harmful effects of forest isolation. 

The first rock that scientists analyzed on Mars with a pair of chemical instruments aboard the Curiosity rover turned out to be a doozy – a pyramid-shaped volcanic rock called a "mugearite" that is unlike any other Martian igneous rock ever found.

Dubbed "Jake_M" – after Jet Propulsion Laboratory engineer Jake Matijevic – the rock is similar to mugearites found on Earth, typically on ocean islands and in continental rifts. The process through which these rocks form often suggests the presence of water deep below the surface, according to Martin Fisk, an Oregon State University marine geologist and member of the Mars Science Laboratory team.

The first scoop of soil analyzed by the analytical suite in the belly of NASA's Curiosity rover reveals that fine materials on the surface of the planet contain several percent water by weight. 

The quest for evidence of life on Mars could be more complicated than previously thought due to  perchlorate,, a salt comprised of chlorine and oxygen, that interferes with the techniques used by the Curiosity rover to test for traces of life. The chemical causes the evidence to burn away during the tests.

NASA's Curiosity Rover has sampled a surprising diversity of soils and sediments along a half-kilometer route during its first few months on Mars. And what it has found tells a complex story about the gradual desiccation of the Red Planet.

Perhaps most notable among findings from the ChemCam team is that all of the dust and fine soil contains small amounts of water.

In a series of papers covering the rover's top discoveries during its first three months on Mars, the rover's ChemCam instrument team up with an international cadre of scientists affiliated with the CheMin, APXS, and SAM instruments to describe the planet's seemingly once-volcanic and aquatic history.

Reports of a new hepatitis virus earlier this year were a false alarm, according to U.C. San Francisco researchers who correctly identified the virus as a contaminant present in a type of glassware used in many research labs.

The finding highlights both the promise and peril of today’s powerful “next-generation” lab techniques that are used to track down new agents of disease.