Health, Science and Environment

More than 20 states have now issued orders requiring people to wear face masks in public as the rate of new coronavirus cases surges to record heights in parts of the United States.

The U.S. has recorded more than 1 million coronavirus infections over the past month alone, pushing the number of confirmed cases past the 3 million mark this week.

Days after Brazil's president said he had contracted COVID-19, another South American leader, Bolivia's interim president, Jeanine Áñez, said she too had tested positive for the coronavirus.

"I feel good, I feel strong, I will continue to work virtually from my isolation," Áñez said in a video posted to her Twitter account.

The World Health Organization has issued a new scientific brief that summarizes what's known about the different ways the coronavirus can transmit.

Scientists say they've identified an enzyme that could help explain how exercise can slow or even reverse some signs of aging in the brain. "Exercise in a bottle" isn't around the corner, but it's not out of the question either.

The idea builds on an observation a few years ago that certain parts of the brain can actually grow, even in older people.

AILSA CHANG, HOST:

Enough is enough. That's what we're hearing from young people as they demand change not just from police departments and legislators but also from their educators. Petitions with thousands of signatures are circulating all over the country now, urging schools to incorporate what's called anti-racist education into their curricula. Here's Angela Frezza and Daniel Afolabi, former students from West Lafayette, Ind., who started a petition there.

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