Facebook clearly has big, long-term ambitions, and this week we learned just how big. At its annual F8 developer conference, the company let us take a peek into its future technologies, some of them pretty far out — in every sense. Karissa Bell joins us to talk about brain-machine interfaces that might someday let you type faster than a keyboard ever could or let you "hear" through your skin. Back in the present, the Galaxy S8 is finally here, and we give our final verdict on Samsung's latest iPhone killer.