Arizona's Mark Kelly, Ruben Gallego and other Senate Democrats are all talk and no action to stop Trump from running ...

The phase and the group velocity of light propagating in conventional optical media cannot exceed the speed of light in ...

It's fairly common for people to think sending cash by U.S. mail is against the law, says the fact-checking website ...

NBC News investigative correspondent Tom Winter and former federal prosecutor Brendan Ballou join Nicolle Wallace to discuss ...