Roger Federer felt the need to clarify last month that he's not Robocop. On Monday, Caroline Wozniacki's father reminded the press that Caro is no robot either.
The distinctions seem unnecessary, as Federer isn't a wounded cop living in a dystopic Detroit and Wozniacki clearly has feelings. We know they're not machines. Plus, robots can't play tennis anyway ... or can they?! (Cue inquisitive music.)
Check out these tennis-playing quadrocopters developed by researchers in Zurich: