Physicists Make Real-Life Tractor Beam From Plain Ol' Water

You don't need to be a beach bum to understand waves: they move objects along with them, pushing boats and swimmers to the shore. There's even a name for it, the Stokes drift model. But for the first time, physicists have figured out how to do the opposite, using waves to bring a floating object backward to the source » 4/09/14 11:00am 4/09/14 11:00am