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The winner of the 2021 Regeneron Science Talent Search is 18-year old Yunseo Choi for playing theoretical "matchmaker" using algorithms. She won $250,000.

Kansas is the overall No. 1 seed. North Carolina got another of the top spots. The other No. 1s, Virginia and Oregon, were considered surprises in some circles. The 68-team tournament starts Tuesday.

Andriy Yermak, top aide to President Volodymyr Zelenskyy, tells NPR's Steve Inskeep that Ukraine has an "urgent" need for sustained military aid.

It's President Biden's first trip to Canada as president. He and Prime Minister Justin Trudeau are expected to discuss their concerns about the security crisis in Haiti.

Live on YouTube, Bob Boilen and Kevin Cole will watch their favorites entries to the 2020 Contest and discuss what made them stand out from the thousands we saw this year.

According to numbers released Tuesday, Twitter's one-year-old video-sharing app Vine now has about 40 million registered users. The app lets users shoot a maximum of six seconds per Vine, so we wanted to know why the limit's set at six seconds and not a second longer.

This week brings four novels about love: childhood love in immigrant Brooklyn; married love in dot-com San Francisco; intergenerational love and tension in Philadelphia; and an academic father's sometimes obtuse love for his three daughters. In nonfiction, football star Michael Oher describes his experiences in foster care.

Ukraine's bookstores have expanded despite the war, fueled by interest in works by Ukrainian writers, some who have been killed by Russian forces. But a Russian missile struck a top printing plant.

Across the country, including in swing states, people have been priced out of buying homes. Record numbers are finding rent unaffordable. Biden and Trump have very different ideas for how to fix it.

The U.S. Forest Service says the South and Southwest may face above-normal fire danger. In California, for instance, drought has killed millions of trees that are now dry fuel.