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Yale researchers have found new evidence of human habitation on Machu Picchu as far back as 1420, some three decades earlier than previously believed.

When Medicare began in 1965, its backers expected benefits to expand over time, but politics have mostly stymied that. Congressional Democrats are trying again as part of a $3.5 trillion budget plan.

"To defend this Nation, we need a healthy and ready force," Defense Secretary Lloyd Austin said in a memo to employees. Already, about 62% of active-duty service members are fully vaccinated.

Allison Crimmins, who heads the National Climate Assessment, says the U.N.'s landmark report confirms the need for "significant, sustained action" to reduce emissions.

Carnivorous plants are rare, but now botanists say they've found one that's long been overlooked. It lives just outside Vancouver, British Columbia, and in other parts of the Pacific Northwest.

Federal agencies are doubling down on stopping extreme wildfires. They're also limiting the use of fire to help with fire prevention, which is concerning some fire scientists.

The U.S., which accuses President Alexander Lukashenko of corruption and repression, imposes new sanctions on his financial backers on the one-year anniversary of an election widely considered rigged.

NPR's Ari Shapiro talks with Dr. Jane Lubchenco, who leads climate and environment science efforts at the White House, about the findings of the United Nations' major new report on climate change.

Renovations to San Francisco's Golden Gate Bridge made it produce an eerie humming sound. Guitarist Nate Mercereau heard its musical potential and made an album by playing along.

Researchers using DNA analysis say a body buried in feminine clothing and with a sword was neither strictly male or female. The grave shows the high status of some nonbinary people in their community.