Researchers in Switzerland have created flying robot quadrocopters capable of responding fast enough to juggle and bounce a ball back and forth with one another. Here’s something you don’t see every day. Researchers in Switzerland have designed small, remote control “quadrocopters” capable of seeing and reacting fast enough to bounce a ball back and forth.Equipped with a tennis racket on top of them, the duo bounces the ball around a netted-off section of a Swiss building. Both units are controlled by humans, but could theoretically be programmed as well. Unfortunately, no program is fast enough to play pong in real...