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The Soviet Union built research institutes in Siberia as innovation centers during the Cold War. Since then, there's been a brain drain. Tech innovators remain, but some have faced legal challenges.

U.S. Homeland Security Secretary John Kelly will wrap up a two-day tour of the nation's border with Mexico on Friday as plans take shape to build a wall along the 2,000-mile divide between the two countries.

Airs Tuesday, August 2, 2016 at 8 p.m. on KPBS TV

Blake Crouch's new book — about a mild-mannered professor who's conked on the head and wakes up in another universe — doesn't make much sense, but it's a fast, tasty read with a killer twist.

Heirloom foods have grown in popularity, making their way into gardens, farms, farmers markets and restaurants. A sociologist says they offer a powerful emotional and physical connection to the past.

Scientists meeting in San Francisco issue their 2016 report card. "The Arctic as a whole is warming at least twice as fast as the rest of the planet," one says, and it is getting progressively worse.

Research shows that many college students across the country are working, borrowing and still falling behind.

Companies touting their wares at an annual border security conference in Texas are more upbeat than usual. The expo features cameras mounted on telescoping poles, spotlight weapons and lots of drones.

Three months after ISIS was pushed out of Mosul, the eastern half of the Iraqi city is bustling and growing. But the badly damaged western half is in ruins, and its residents are angry and resentful.

Old Italian violins like those made by Stradivari are famous for their ability to project their sound. But a study found people in a blind test thought new violins projected better than old ones.