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A man in a mask walks past a mural on the side of a building in New York City in April.

Politicians argue. Those opposed to mask mandates protest. But meanwhile, growing evidence shows that mask wearing is a critical tool in curbing the spread of the coronavirus.

After six trials and 23 years behind bars, charges are being dropped against Curtis Flowers (pictured here in Dec. 2019) over a 1996 quadruple killing in Mississippi. The U.S. Supreme Court struck down a conviction last summer, citing among other things, the deliberate elimination of Black jurors from Flowers' trials.

After 6 Trials, Prosecutors Drop Charges Against Curtis Flowers

Flowers spent 23 years behind bars for a 1996 quadruple killing at a Mississippi furniture store. Prosecutors said Friday that there were no credible witnesses available for a seventh trial.

Agustin Aguilar holds his mask so barber Adrian Mayorga can cut his sideburns at the Country Club Barbers, Wednesday, May 27, 2020, in Escondido, Calif.

San Diego Officials Continue To Stress The Importance Of Wearing Masks Amid Coronavirus

San Diego County officials and researchers stress the importance of wearing face coverings in public.

Gen. Gustave Perna, shown hear at a Senate confirmation hearing in June, tells NPR that if a safe and effective COVID-19 vaccine is approved by the FDA in December, "10 to 30 million doses of vaccine will be available that we can start distributing" in the U.S.

Operation Warp Speed's Logistics Chief Weighs In On Vaccine Progress

Gen. Gustave Perna says as soon as the FDA deems a vaccine safe and effective, his team is ready to coordinate deployment of tens of millions of doses as early as next month.

Demonstrators in New Delhi shout slogans during a protest against the arrest of climate change activist Disha Ravi for allegedly helping to create a guide for anti-government farmers protests.

Twitter In Standoff With India's Government Over Free Speech And Local Law

Twitter blocked hundreds of accounts the Indian government said were inciting violence. Then it unblocked them. Now it's stuck between Indian law and defending free speech.

Greta Thunberg says she wants people to use the power of their votes to elect leaders who will work to reduce carbon emissions and slow global warming.

Greta Thunberg To U.S.: 'You Have A Moral Responsibility' On Climate Change

The young Swedish activist led a protest at the White House on Friday. But she wasn't looking to go inside. "I don't want to meet with people who don't accept the science," she says.

Will Antibodies After COVID-19 Illness Prevent Reinfection?

Scientists don't know whether people who have been exposed to the coronavirus will be immune for life, or if it can infect us again and again, like the common cold.

Thanks to ethylene, one bad apple spoils the lot.

Science Reveals How Fruit Keeps A Lid On Ripening Until The Time Is Right

Humans have harnessed the ripening power of the plant hormone ethylene for centuries, but a recent discovery of how a plant controls the hormone may lead to more precise human control of ripening.

Rain lingers on the horizon behind Scripps Pier, which is where weather balloon launches are happening on Mar. 10, 2020.

Major Ocean Research Effort Centered In San Diego

NOAA will fund a major research effort in San Diego, looking at the interplay between the ocean and air.

The auroral dunes appear as green waves in the sky.

A New Form Of Northern Lights Discovered In Finland – By Amateur Sky Watchers

It was the members of a Facebook group who noted that the auroras they'd seen didn't look like any that had been previously catalogued. So physicists asked them to take a few carefully timed photos.

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