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Several COVID-19 vaccine candidates are being tested now. But why does it take 30,000 volunteers to know if one is safe and effective? And what does it mean to say a vaccine candidate is working?

Farm workers in California are facing the double health threat of working during the coronavirus pandemic and fire season. Wildfire smoke often makes the air quality dangerous for harvesting produce.

Chess grandmaster Hikaru Nakamura uses the video-streaming site Twitch to teach others the game. During quarantine he's amassed over 350,000 followers, and renewed interest in the century-old game.

The annual Pint of Science festival sees scientists and local communities gather in bars, cafes and other places to talk science. But in 2020, the festival will be online due to the pandemic.

Soumana Saley has a passion for leather crafts — and for education. But the pandemic has presented challenges as he builds his reputation and his school in Niger.

NPR's Steve Inskeep talks to Joanna Slater, India bureau chief for The Washington Post, about the nation's confirmed infections exceeding 4.2 million — overtaking Brazil with 4.1 million.

St. Burchiardi church's custom organ has been playing a composition titled "As Slow As Possible" for 19 years. The piece will take 639 years to unfold. Stay tuned for another chord change in 2022.

While tear gas and rage get most of the attention in the demonstrations, there are also tender and hopeful moments — including singing, poetry, and talk of healing — taking place.

Coronavirus cases in the U.S. are on the decline, although almost 45,0000 new cases were reported this weekend. There are fears that weekend gatherings over Labor Day will lead to a surge in cases.

"We're out here and we need to be, but I'm tired and I'm on edge," a left-wing demonstrator said on Sunday evening. "I'm also terrified," she added, noting rising tensions between the opposing groups.