ACE INVENTOR—Above, Kevin Ma, 15, tries out his robotic shot sensor with a ping pong paddle. Above right, his technology pairs with a tennis racket. At right, the teen takes a swing on the tennis court.Practice makes perfect, but a little computer assistance never hurt.
Kevin Ma is a 15-year-old tennis player from Oak Park who built a robot to help him perfect his game. Then he built a second one, to help him play ping pong better.
The teenager published an academic paper on his creation last fa...
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