Fur 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.
Vice President Mike Pence at the National Space Council’s first meeting in Chantilly, Va., in October.
An arctic fox near Helagsfjället mountain in Sweden. Foxes in the area were severely inbred until three males from a Norwegian captive breeding population turned up.
A sauropod footprint found in Scotland was among several that included tracks left by smaller, two-legged meat-eaters. Their presence together upends a theory that the larger plant-eaters waded into shallow, muddy waters to evade predators.
Sudan, the last male northern white rhino, who died in March.
Dr. Mark Willenbring at his Alltyr outpatient clinic for substance abuse in St. Paul.
A helicopter from the nearby Chinese icebreaker Xue Long arrived to pick up the first batch of passengers from the stranded Russian ship Akademik Shokalskiy.
Researchers at the University of Glasgow studied physiological indicators of stress in clown fish living with bleached anemones, a result of warming temperatures and other environmental disturbances.
Neil Gershenfeld of the Massachusetts Institute of Technology says that synthetic biology, which involves the creation of biological systems intended for specific purposes, can generate scientific advances as well as ethical questions.
Jon Pace is the discoverer of the largest known prime number, 23.2 million digits long.
A fossilized human jawbone discovered in Israel. The find may suggest that Homo sapiens first migrated out of Africa at least 50,000 years earlier than previously thought.
One of the 2.1 million-year-old artifacts, right, recovered from a gully in western China, left, suggest that hominins may have left Africa far earlier than previously believed.
A lunar eclipse, visible in Sumatra, Indonesia on Saturday, could be seen alongside Mars, which is the closest it's been to Earth in 15 years.
Marco Zozaya in March near his home in Mexico. He aspires to be a science communicator like Neil deGrasse Tyson, but faces the conundrum of internet audiences and algorithms that may prefer drama over scientific information.
A promotional composite image from Knightscope showing the K5 Autonomous Data Machine.
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