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Yahoo says the massive hack, previously said to have affected 1 billion accounts, in fact likely compromised 3 billion accounts. However, the company says corrective actions have already been taken.

For centuries, scientists thought the human brain had no direct connection to the body's immune system. Now researchers seem to have found one, and say it may offer clues to multiple sclerosis, too.

Sunday night's attack at the Route 91 Harvest Festival left 527 people injured and 59 people dead.

Many things went wrong during the prime minister's speech in Manchester on Wednesday: She had coughing fits, a prankster handed her a pink slip and a party slogan behind her fell apart.

Doctors and emergency officials are still trying to figure out exactly how many people were shot in Las Vegas. The wide range of injuries and the sheer number of people injured are challenges.

"I don't think we do Ali any good by treating him as a saint," says biographer Jonathan Eig. "He was a human being, and he was deeply flawed, but ... he had the spirit of a rebel."

Republicans and Democrats alike are upset about the massive hack of Social Security numbers and other sensitive information at the consumer credit reporting company.

NPR's Robert Siegel speaks with gun expert Paul Glasco to learn more about the device found in Stephen Paddock's Las Vegas hotel room, which can enable a semi-automatic rifle to fire continuously.

Nearly a week has passed since the worst mass shooting in modern U.S. history and investigators are continuing to look for clues into why the shooter did what he did.

Next week is critical in the Trump administration's vow to redo the Iran nuclear deal. Options are being prepared for the president to announce by Friday. Here's a look at how they could play out.