Fossilized human footprints shown at the White Sands National Park in New Mexico. According to a report published in the journal Science, the impressions indicate that early humans were walking across North America around 23,000 years ago.
National Park Service via AP
In the first Biden administration rule aimed at combating climate change, the Environmental Protection Agency is proposing to phase down production and use of hydrofluorocarbons, highly potent greenhouse gases commonly used in refrigerators and air conditioners.
A bald eagle perches on a tree at Sunset Park in Rock Island, Ill., in March. A new study says that many species of birds increasingly moved into urban areas as human activity waned during the pandemic.
Joel Lerner/Xinhua News Agency/Getty Images
Evidence seized from a drug trafficking operation in central California in early 2020 included methamphetamine and fentanyl with a street value of $1.5 million, authorities said.
Tulare County Sheriff's Office via AP
Dr. Janet Woodcock, acting commissioner of the Food and Drug Administration, appears before a Senate committee in July. Many public health leaders say letting the agency go so long without a permanent director has demoralized staff and sends the wrong message about the agency's importance.
Stefani Reynolds/Pool/The New York Times via AP
A male Bougainville Whistler (Pachycephala richardsi), a species endemic to Bougainville Island. This whistler is named after Guy Richards, one of the collectors on the Whitney South Sea Expedition.
Everyday tasks — such as buttoning a shirt, opening a jar or brushing teeth — can suddenly seem impossible after a stroke that affects the brain's fine motor control of the hands. New research suggests starting intensive rehab a bit later than typically happens now — and continuing it longer — might improve recovery.
This photo made available by the Library of Congress shows a demonstration at the Red Cross Emergency Ambulance Station in Washington during the influenza pandemic of 1918.
Library of Congress/AP