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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.

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.

NPR's Kelly McEvers speaks with Tawny Finn, who lost her younger sister Angie Gomez Sunday night. Gomez was shot and killed while attending the Route 91 Harvest Festival in Las Vegas.

The track is a blurt of jolting joy that opens with a welcome exclamation — "Good morning!" — before rumbling through two minutes of sunny menace.

Republicans in the White House and Congress have billed their tax proposal as a boost for the middle class. But a nonpartisan analysis finds the richest Americans would see the most immediate gains.

Folks are beginning to rebuild their lives after Hurricane Maria, and for Puerto Rico's plena musicians, it means rebuilding a sense of culture and community.

President Trump is traveling to Las Vegas Wednesday after Sunday's mass shooting. Also, Democrats are pushing for measures related to gun control, and Theresa May's conservative party is in disarray.

Jacques Dubochet, Joachim Frank and Richard Henderson worked to develop cryo-electron microscopy, which the Royal Swedish Academy says "both simplifies and improves the imaging of biomolecules."

The jazz drummer shares why he opens his latest album with a recitation by his grandfather, "the ultimate bad hombre."