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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.

Rory McIlroy was already one of the best golfers of all time. His win at the Masters on Sunday gave him the career Grand Slam, cementing that legacy. He's one of only six male golfers to do that.

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

NPR's Juana Summers talks with Washington Post reporter Alex Horton about internal documents from the National Guard assessing public sentiment about the federal takeover of Washington, D.C.

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.

Of those, less than 27,000 people used the federal HealthCare.gov site to select a plan, according to data from the Department of Health and Human Services. The government says 106,185 Americans picked out plans in the first month of enrollment.

NPR's Rachel Martin talks to Democratic presidential candidate Sen. Bernie Sanders about President Trump's actions on Iran and the escalation of tensions, along with the upcoming Iowa Caucuses.

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.

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.

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.