Tuesday, May 31, 2011
Sunday, May 22, 2011
Flights in Risk:Iceland volcano erupts Again with 20 Kilometer Smoke Column
Friday, May 20, 2011
Monday, May 16, 2011
Old levee breaches in Mississippi
The Mississippi River at Vicksburg crept to within inches of its 1927 record on Saturday, as residents anxiously watched flood waters invade their historic city.
Sunday, May 15, 2011
Atomic Clocks With Unprecedented Accuracy
A team of physicists from the United States and Russia announced that it has developed a means for computing, with unprecedented accuracy, a tiny, temperature-dependent source of error in atomic clocks. Although small, the correction could represent a big step towards atomic timekeepers' longstanding goal of a clock with a precision equivalent to one second of error every 32 billion years -- longer than the age of the universe.
Saturday, May 14, 2011
On Pangaea, Latitude and Rain Dictated Where Species Lived
More than 200 million years ago, mammals and reptiles lived in their own separate worlds on the supercontinent Pangaea, despite little geographical incentive to do so. Mammals lived in areas of twice-yearly seasonal rainfall; reptiles stayed in areas where rains came just once a year. Mammals lose more water when they excrete, and thus need water-rich environments to survive. Results are published in the Proceedings of the National Academy of Sciences.
Friday, May 6, 2011
Infanticide Was Prevalent in Roman Empire
Infanticide, the killing of unwanted babies, was common throughout the Roman Empire and other parts of the ancient world, according to a new study.
Thursday, May 5, 2011
Sunday, May 1, 2011
Global warming threat amid nuclear doubts: IEA
A global warming target could be missed three times over if countries fail to promote clean energy, the International Energy Agency warned Thursday, amid a possible slowdown in atomic power growth.
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