The International Space Station will stay in orbit for at least four years after 2020, NASA said.
The distribution of the sweet potato plant has baffled scientists. How could the plant arise from a wild ancestor in the Americas and wind up on islands across the Pacific?
Cherry tomatoes. Researchers found that domesticated tomatoes like these were less resistant to whiteflies than currant tomatoes, a wild species.
Fully programmable robots were on display at the Humanoids 2013 conference in Atlanta. The goal is to enable them to work effectively and even autonomously in emergency situations.
From left, Hanna Zavorotnya, Maria Zagorna and Maria Shovkuta are among the women who chose to return to the Chernobyl exclusion zone after the 1986 nuclear accident.
An 18th-century ship was discovered last month in Old Town Alexandria, Va., the fourth discovered in recent years within a two-block radius.
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.
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.
A male chimpanzee drinking at a waterhole in Fongoli, a Senegalese savanna. Temperatures at Fongoli can reach 110 degrees Fahrenheit or more.
A field technician excavating the remains of an amputated limb at Manassas National Battlefield Park in October 2015. The discovery of two nearly complete sets of soldiers’ remains, 11 partial limbs and other artifacts appeared to date to the Second Battle of Bull Run, which ended Aug. 30, 1862.
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.
An image made by the Iceye-X1 satellite showing the Noatak National Preserve in northwest Alaska.
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.
Naomi Oreskes in her office at Harvard University's Science Center. She has been praised by climatologists for communicating climate science to the public.
Cnidarians, including corals and many jellyfish, feed and defend themselves with stinging capsules. Some sea slugs have evolved several lines of defense.
An orca whale has carried her dead calf on her nose for days in the Pacific Northwest.
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