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Hold out your hand for a century, and 100 million particles of dark matter will pass through each second without leaving a trace. Still, a physicist in South Dakota thinks he may be able to catch one.

After the White House announced Saudi Arabia's king would meet this week with President Obama in Washington, D.C., Saudi Arabia announced the king would send other Saudi leaders instead.

Yukiya Amano, director-general of the International Atomic Energy Agency, said today that Iran has agreed to steps that will let international inspectors learn more about its nuclear program.

Music and the human brain. A neuroscientist and opera singer guides us through the science of how and why music moves us.

Music and the human brain. A neuroscientist and opera singer guides us through the science of how and why music moves us.

U.S. health officials said equipping six cities with extra testing would pick up under-the-radar viral spread. But an NPR investigation finds conflicts and shortages caused painful delays.

Named for its abnormal shape and expansion pattern, "the blob" is a patch of unusually warm water spreading across the Pacific.

Over the next two years, McDonald's will transition its U.S. restaurants to a new antibiotics policy. Several of the chain's competitors have also committed to curb antibiotics in their supply chain.

A new study in the journal Bioacoustics found that 65 different species of animals have their own form of laughter. Study co-author Sasha Winkler describes the sounds animals make during play.

The results assure a second five-year term for Prime Minister Abiy Ahmed.