In this July 7, 2014, photo, Ph.D. candidate Stephen McGill works with a Nao RoboCup entree at the University of Pennsylvania in Philadelphia. The international robot soccer tournament called RoboCup takes place in Brazil right after the World Cup. The ultimate goal of the yearly event is bold: To create a robot team that can defeat the human World Cup winners by 2050.  (AP Photo/Matt Rourke)

PHILADELPHIA (AP) — When robots first started playing soccer, it was a challenge for them just to see the ball. And to stay upright.

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