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.
This mummified, severed head was recovered from an ancient Egyptian tomb in 1915. Scientists needed to collect DNA to figure out whom the head belonged to.
Plant growth is increasing because of rising carbon dioxide. But plants return carbon dioxide into the atmosphere at night, in a process called respiration.
An orca whale has carried her dead calf on her nose for days in the Pacific Northwest.
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.
Juul is under federal investigation for marketing its discreet, flash-drive-resembling e-cigarette product to youth.
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.
Over the past 17 years, the numbers of some bird species in French farming regions have dropped considerably. Meadow pipits have declined by 68 percent.
An artist’s rendering of an Earthlike exoplanet orbiting another. Scientists haven’t been able to measure an exoplanet’s tilt yet, but some suspect that a planet’s tilt is key to supporting life.
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