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Landfills are among the nation's largest sources of methane, a greenhouse gas far more potent than carbon dioxide. But accurately measuring methane is a major challenge to reducing it.

The U.N. says today symbolically marks the moment when the world's population reaches 7 billion. A little more than two centuries ago, the global population was 1 billion. How did it grow so big so fast? With the help of a sound montage and video, it gets a bit easier to see how the Earth can produce that kind of a crowd.

Washington's lack of congressional representation has prompted some residents — even those who've called the district home for years — to maintain voting registration elsewhere.

Wal-Mart's plans to come to Washington, D.C., are up in the air after the City Council voted to require the world's largest retailer to pay workers a living wage. The case highlights some of the difficulties — and opportunities — big-box stores sometimes face entering urban markets.

In this week's StoryCorps, we hear about an unusual fundraising idea to help send school kids on trip to Washington, D.C.

Seventy years ago, U.S. assault troops landed on Omaha Beach during the invasion of Normandy, deciding the course of history. What might be different today if they had been turned back?

The city is no stranger to First Amendment demonstrations, but police will have a heightened challenge this weekend.

Nicholas Simmons, 20, hadn't been seen since New Year's Day. On Sunday, USA Today published a photo of him. The young man was in Washington, D.C., trying to keep warm on a steam grate. His family saw the picture. With help from the newspaper, an AP photographer and police, their loved one was found.

Washington, D.C., Attorney General Karl Racine takes issue with Amazon's policies for third-party sellers that prevent them from selling products for lower prices elsewhere.

NBC News posted video of the judge leaving her home in South Bend, Ind., with her husband and children, all dressed in formal attire Saturday. She is expected to be nominated to the Supreme Court.