This week, Gwen brings you the latest on something that was science fiction when most of us were kids and is now — quietly, without much fanfare — becoming ordinary life in cities across America.

Self-driving cars.

Real vehicles. On real roads. In real traffic. Picking up real passengers right now, today, in cities from Phoenix to Atlanta to Los Angeles — with no human driver behind the wheel.

How did we get here? What's actually happening? And where is all of this going?