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Mountaineers began leaving Mt. Everest yesterday, as Sherpas refuse to climb again this year, out of respect for 16 who died in last week's deadly avalanche.
The Y chromosome, which distinguishes males from females at the genetic level, appeared some 180 million years ago, according to a new study published in Nature.
Arctic sea ice reached its maximum extent for the year on March 21, 2014, according to the National Snow and Ice Data Center. It was the fifth lowest on record.
A total eclipse moon has to happen at full moon. Outer planets are always near the full moon in their month of opposition. Mars reached opposition April 8 ...
Scientists are watching a giant mass of sub-surface water in the Pacific. When this water reaches the sea surface, it could set off a powerful El Nino.