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In our December issue, Popular Science names the 100 best innovations of the year: bombproof wallpaper, self-parking cars, the fastest helicopter, and 97 more. Plus inventor profiles and videos.
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from West Chester, PA
Yea this will be real useful for all the millions of coaches out there who can afford twenty of these. I mean it's only going to cost them $2,000,000 OR they could try and do it all old-fashioned like and use a marker.