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Article 5 of the North Atlantic Treaty means that an attack on one member state is determined to be an attack on all. Ukraine is not part of the alliance — but some of its neighbors are.

Russian President Vladimir Putin also said that any attempt to install a no-fly zone in Ukraine would cause catastrophic consequences for Europe and the world.

Dmitriy Cherepanov, a lifelong Mariupol native, created MRPL.life, a site dedicated to helping residents locate missing loved ones in the besieged Ukrainian city.

Negotiators from nearly 200 countries have spent a week in Paris trying to come up with a new treaty to curb global warming. They've got the rest of this week to finish.

Around the world, many of us start our day with a drug derived from a natural insecticide: caffeine. Murray Carpenter tells the tale in Caffeinated: How Our Daily Habit Helps, Hurts and Hooks Us.

The president says he's pushing for the controversial Trans-Pacific Partnership in part to boost "Made in the U.S.A." products around the world. So why make the pitch at Nike?

The fifth week of the partial government shutdown is coming to a close. Some federal workers who are feeling the effects of the shutdown tell their stories.

Musso & Frank Grill opened before there was a Hollywood sign. Since 1919, stars, studio heads and writers have settled into the restaurant's red leather banquettes to negotiate, gossip, and eat.

Researchers in Seattle have created a public observatory for studying the visual circuitry in a mouse's brain. Among the attractions: watching 18,000 neurons respond to Orson Welles' Touch of Evil.

The Food and Drug Administration is weighing whether to allow a birth control pill to be sold over the counter for the first time. An advisory committee opens a two-day hearing Tuesday.