In 2010, Kinect for Microsoft's Xbox gaming system, in which users played with gestures and spoken commands rather than a controller, was ready to go to market.

But just before it did, a woman who worked for the company took the game home to play with her family, and a funny thing happened. The motion-sensing devices worked just fine for her husband, but not so much for her or her children.

That is because the system had been tested on men ages 18-35 and did not recognize as well the body motions of women and children, said Peggy Johnson, executive

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