Clockwise from top, researchers Richard Roberts, Vladimir Ulianov and Maxim Kozlikin in a chamber of the Denisova cave in Siberia, where the fossil of a 90,000-year-old human hybrid was discovered.
Pronghorn antelope along a fence northwest of Casper, Wyo. A study has found that wildlife move far less in regions where humans are present, ultimately threatening the viability of a species.
The large Whirlpool Galaxy, left, is known for its sharply defined spiral arms.
New research suggests there is ice water up there, in craters at the poles where it’s dark and cold.
An illustration of Haringtonhippus francisci, an extinct horse species that was found in North America during the last ice age. Rick Hunter, a Utah paleontologist, said the horse, whose skeleton was discovered in a Utah backyard, may have looked similar to this.
Francisco J. Ayala, one of the university's more generous donors and a star professor, will leave the university as of Sunday without "emeritus" status.
A computer-generated image of a single Neanderthal toe bone found in a Siberian cave in 2010.
Donkeys awaiting slaughter at the Goldox Donkey Slaughterhouse in Kenya. As manufacturers of a traditional Chinese medicine struggle to meet rising demand, they are looking to developing countries for donkey hides.
Dr. Jennifer A. Doudna. Three years ago, she helped make one of the most monumental discoveries in biology.
Calestous Juma in 2004. His championing of sustainable development in sub-Saharan Africa was informed by his arduous childhood in a poor village there.
Europa, one of Jupiter’s larger moons, lower left, and the shadow of Io, another moon, upper right, are joined by 12 recently discovered moons orbiting the solar system’s largest planet.
A march in Washington of women demanding legalization of abortion in 1971. With President Trump about to nominate a second justice to the Supreme Court, legal experts are debating what a more conservative court would mean for abortion rights.
“I am a retired patent attorney,” said Barbara Rae-Venter. “None of this is a planned event.”
The view from the summit of "Mount Thoreau" looking south toward the Palisades and the Northern boundary of Kings Canyon National Park.
Researchers say that the skull of Homo naledi, a hominin that lived 236,000 to 335,000 years ago, contained a brain the size of an orange that had a similar shape and structure with that of modern humans.
A bee’s sting won’t hurt an elephant’s tough hide, but bees can swarm and wound more sensitive places like the trunk, eyes and mouth.
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