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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.

More details are emerging about Stephen Paddock, who perpetrated the massacre in Las Vegas. The reclusive professional gambler had few friends and made little impression on his neighbors.

Law enforcement officials are still searching for a motive in the mass shooting. Computers found at the gunman's home may hold more clues about him and the reasons behind the attack.

In Las Vegas, NPR's Mary Louise Kelly takes stock of the mood amid vigils to those who lost their lives on Sunday and tourists returning to the city as usual.

For two weeks, black NFL players have been under an even brighter spotlight than on any given Sunday and while some families are turning away from the game, others are watching closely.

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.

Alicia Montgomery is returning to NPR after a year at WAMU

The platforms promoted the name of a man falsely accused of being the shooter by surfacing less-credible sites. The companies say they're working on fixes, but analysts say the challenge is massive.

American rocker Tom Petty has died at age 66. Petty is known for hits like "American Girl" and "Refugee" — hard driving paeans to everyday folks.