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.
A robust ghost pipefish in waters off Indonesia. With some species of pipefish, fathers are susceptible to what scientists call the Bruce effect.
Adult emperor penguins and their chicks near a research station in Terre Adélie, Antarctica. Researchers found that male penguins from one colony often slipped out to hunt during breeding season.
The Tremaster mirabilis starfish, one of several species of sea star living in deep waters off Greenland’s coast that have surprisingly complex eyes.
The skeleton of a child found in Hungary was partially mummified by copper from a coin placed in its hand.
A crow picking up a discarded cigarette at Puy du Fou, a theme park in France that has enlisted six birds as tiny, winged maintenance workers.
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.
The Caño Cristales in Colombia, home to Macarenia clavigera, which turns the river bright colors in the rainy season. It has become a tourist attraction, but oil reserves nearby have pitted the government against a petroleum company.
A U.F.O. in New Mexico in 1957. For astronomers, the biggest problem with alien visitation is not the occasional claim of mysterious light in the sky, but the fact that we’re not constantly overwhelmed with them.
Sunset over the Atlantic Ocean, viewed from the International Space Station in 2014.
Stone pendants and earrings recovered from the Lothagam North Pillar Site in Kenya, which is about 5,300 years old. It was used as a burial site for about 700 years. Then, abruptly and mysteriously, the burials stopped.
An Oriental fire-bellied toad, which was imported into Europe from South Korea.
The Sorpe reservoir in northwest Germany, one of four freshwater reservoirs observed in a recent study that found that carbon dioxide absorbed in lakes, rivers and streams can affect entire ecosystems.
A baobab tree at Epupa Falls in Namibia. Researchers suspect that Africa's "wooden elephants" are succumbing to prolonged droughts and increasing temperatures, which are parching the trees, leaving them unable to support the weight of their massive trunks.
A computer-generated image of a single Neanderthal toe bone found in a Siberian cave in 2010.
Zhong Zhong, one of two cloned monkeys at the Chinese Academy of Sciences in Shanghai. They are the first primates cloned by transferring DNA into fetal cells.
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