South America's Chinchorro people lived in an extremely dry desert region where the dead turned into mummies naturally. But at some point, they stopped leaving the process to nature. Now, scientists say the Chinchorros began mummifying their dead as their climate grew wetter.
In light of this summer's record high temperatures, we find perspective on really hot temperatures. In an experiment, scientists at Europe's CERN laboratory claim to have achieved the highest temperature ever produced by humans — about 5.5 trillion degrees. Audie Cornish and Melissa Block have more.
"We've had time to act — and essentially we haven't acted," says science journalist Michael Lemonick. He describes the threats posed by climate change in his new book, Global Weirdness: Severe Storms, Deadly Heat Waves, Relentless Drought, Rising Seas, and the Weather of the Future.
Critics have charged that the two-year federal investigation into two researchers who wrote a famous report on drowned polar bears was a witch hunt. The probe is over, but the scientists have not been allowed to see its conclusions, their lawyer says.
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