Hot Heads: Why Mammals Need R.E.M. Sleep - The New York TimesFur seals can switch off and on R.E.M. sleep when they're in the sea and on land, a pattern never seen before. Scientists believe it might mean R.E.M. sleep helps generate heat in our skulls, like shivering for the brain.Credit...Mickrick, via Getty Images On a December evening in 1951, Eugene Aserinsky, a physiologist at the University of Chicago, placed electrodes on the scalp of his 8-year-old
Key 'step forward' in cutting cost of removing CO2 from air
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Trump dangles White House visit for North Korea’s Kim if summit goes well
