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POPSArsenic-eating bacteria rewrite evolutionary history Oremland's team isolated and bred these bacteria in the lab. By growing them with with arsenite as the only possible food source, the researchers showed that the bacteria can indeed thrive. The results suggest that arsenic photosynthesis evolved at the same time, or even before, "normal" photosynthesis. Oremland says a similar mechanism might once have fuelled life on Mars or on Jupiter's moon Europa.
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POPSPhoto Tampering Throughout History see rest of photos in original page, linked to my previous post: Digital Forensics: 5 Ways to Spot a Fake Photo http://clipmarks.com/clipmark/D516F80D-C71B-4B53-BB9C-77EA80B8C919/
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POPSHumanity Was Genetically Divided For 100,000 Years the study provides insight into the early demographic history of human populations before they moved out of Africa. “These early human populations were small and isolated from each other for many tens of thousands of years,” says Rosset. MtDNA, inherited down the maternal line, was used in 1987 to discover the age of the famous “Mitochondrial Eve,” the most recent common female ancestor of everyone alive today. This work has since been extended to show unequivocally that “Mitochondrial Eve” was an African woman who lived sometime during the past 200,000 years.
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POPSWhat is the worst environmental disaster in history? Despite the relatively small amount of oil released, several factors contributed to the spill's severity: timing, location, abundance of wildlife and substandard cleanup efforts. In comparison, one of the largest oil spills in history, the rupture of an oil well in the Gulf of Mexico that released 140 million gallons (3.3 million barrels) of oil, caused relatively little damage because it happened in the open sea where currents and winds contained it until it disintegrated.
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