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Somehow, at the beginning of time, there was an imbalance of matter and antimatter. That's how all the stuff in the universe came about. Scientists think they may find an answer by studying neutrons.

Teachers are using a game called Mystery Skype to teach geography and connect with classes around the country and world.

One student was killed and eight injured after a shooting at the STEM School Highlands Ranch near Denver. It happened just miles away from the site of the 1999 shooting at Columbine High School.

NPR's Michel Martin speaks with Congressman Chris Stewart of Utah.

More than three years ago, the Egyptian military, using U.S.-made helicopters, mistakenly attacked a group of tourists — killing 12 people and wounding an American woman.

As the last ISIS remnants hold out in a small pocket of Syria, captured Yazidis have been among those struggling to get out.

A quirk in the Pipeline Safety Act makes it hard to toughen safety regulations on natural gas pipelines to avoid deadly explosions. The act is up for renewal this year.

The Muslim community of Christchurch, New Zealand, is trying to recover after Friday's shooting at two mosques that left 50 people dead.

Critics are raising questions about her comment that "most African ladies' first sexual experience is rape."

The mayor of Brownsville, Texas, was told to expect close to 6,000 migrants released in the Rio Grande Valley this week. A local shelter has been taking in hundreds each day.