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North Korea says it has tested another nuclear device — its most powerful to date. This activity has provoked multiple responses from the White House.

One of the tallest skyscrapers in Venezuela has been occupied by some 3,000 squatters since 2007. The half-finished "Tower of David" — named for its financier, David Brillembourg — is now being evacuated by the Venezuelan government. Ari Shapiro talks to architecture critic Justin McGuirk about the building.

The market for single-serving coffee pods is dominated by Keurig's K-Cups. But they aren't recyclable, and critics say that's making a monster of an environmental mess. Meet the K-Cup Godzilla.

The balance of power in the House and Senate could be upended with Tuesday's vote. We break down some of the key themes and offer a few predictions.

Scientists working to create the perfect atomic clock have a fundamental problem: Right now, on the ceiling, time is passing just a bit faster than it is on the floor.

Former Google X executive Megan Smith started this month as the U.S. chief technology officer. She's only the third person to have the job.

The British are very specific about how they take their tea: black, with milk and sugar. But steeping the optimal cup requires a surprising amount of chemistry. Here's a guide to the science.

The Common Core math standards say students need more than a textbook understanding of concepts like the Pythagorean theorem. So two Colorado teachers teamed up for a lesson in real-world math.

Medicine has changed a lot in the past 100 years. But medical training has stayed much the same. Many schools are now retooling — focusing on teamwork — to train a different kind of doctor.

Russian gas is expensive, so many Poles still rely on coal. Krakow is one of the most polluted cities in the EU's most polluted country. All that coal is akin to "smoking 2,000 cigarettes per year."