A compound taken from marijuana greatly helped some children with a severe and often deadly form of epilepsy, doctors reported.
NBC Nightly News' Pete Williams explains the facts around the killing of DNC staffer Seth Rich.
The relative triviality of sports — and a triumph on the field — provided emotional release for this city in mourning.
New video of Salman Adebi, the suspected Manchester suicide bomber, shows him near the arena days before the attack. But even as police step up the search for accomplices, a rift over intelligence leaks is developing between British and U.S. officials. NBC chief foreign correspondent Richard Engel reports for TODAY from Manchester.
"Brussels is a complex city and European society is different from American society and he doesn't seem to get it," one resident told NBC News.