For years he has played a high-school history teacher who accidentally became president of Ukraine. On Sunday, Ukraine's voters made that fiction a reality.

With nearly all the ballots counted, the 41-year-old Volodymyr Zelenskiy took 73% of the vote, trouncing incumbent President Petro Poroshenko, who received less than 25%. Zelenskiy's victory is widely seen as a rebuke of the status quo, a response to perceived corruption within the political establishment, and a reflection of malaise over the lackluster economy and ongoing conflict with Russia in eastern Ukraine.

Massachusetts Rep. Seth Moulton is joining the large 2020 Democratic presidential field, touting a record of military service, bucking his party and arguing for younger leadership.

"The greatest generation saved our country from tyranny. It's time for our generation to step up and do the same," Moulton said in an announcement video posted early Monday.

An estimated 40 percent of adults in the U.S. snore. And, men: You tend to out-snore women. (Yes, this may explain why you get kicked or shoved at night!)

And despite the myth that snoring is a sign of deep sleep, there's really no upside to it.

Scientists are ramping up research on the possible health effects of a large group of common but little-understood chemicals used in water-resistant clothing, stain-resistant furniture, nonstick cookware and many other consumer products.

More than 80% of parents in the U.S. support the teaching of climate change. And that support crosses political divides, according to the results of an exclusive new NPR/Ipsos poll: Whether they have children or not, two-thirds of Republicans and 9 in 10 Democrats agree that the subject needs to be taught in school.

A separate poll of teachers found that they are even more supportive, in theory — 86% agree that climate change should be taught.