Perhaps the scientists' time could've been better spent inventing robots that can cure cancer or something, but did I mention these are JUGGLING ROBOTS? They don't even cheat by using sensors like other juggling machines.
Instead, each arm uses a linear motor, with a third used to toss the ball up. The balls are tracked by high-speed cameras, which results in a seamless juggling session. Honestly, clowns could learn a thing or two from watching the Czech Technical University's Department of Control Engineering's video, above. [Czech Technical University via Hack a Day via Ieee Spectrum]