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The National Academies of Sciences, Engineering and Medicine sorted through 10,000 studies to determine the good and bad health effects of marijuana. Tight drug restrictions impede research, they say.

A new report from the National Academy of Sciences knocked down some pro-GMO claims, such as that they've boosted crop yields, and urged federal agencies to change the way these foods are regulated.

Also: Kenya's president takes the oath of office for a second term; President Trump will visit Capitol Hill today; and the Bali volcano keeps erupting.

Called "buy-now, pay-later" loans, they essentially work the way they sound. Shoppers borrow money to buy goods then pay the loan back over time, often interest-free. Experts share risks and benefits.

The grim news was expected as the number of open homicide cases continued to climb month after month, making the last 12 months the deadliest on record — an average of 91 deaths per day.

House Democrats held leadership elections Wednesday. Nancy Pelosi was re-elected despite facing an unexpected challenge from Ohio Democrat Tim Ryan. David Greene speaks with NPR's Susan Davis.

Six-player Texas Hold 'em has been too tough for a machine to master — until now. A bot named Pluribus crushed some of the world's best poker players using brash and unorthodox strategies.

What went wrong with Haiti's sanitation plan? The story involves the queen of Spain, the "sanitation champion" and the man with the worst job in the world.

Sen. Bernie Sanders won narrowly, but can he expand his base? Pete Buttigieg again did well, but in another largely white state. And the story of the night was Sen. Amy Klobuchar's third-place finish.

Also: Earthquake survivors are desperate for aid in Iran; California school officials protected kids from a shooter by locking down the school; and baseball names its Managers of the Year.