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"XKCD minus XKCD is a site dedicated to removing XKCD from the XKCD comic strips, with apologies to Garfield Minus Garfield." Very droll.
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"Harrison's concept–which works, by the way–uses the body as a sort of echo chamber. Which is to say, when the user taps a particular part of their body, a sensor worn around the upper arm can tell if the tap-point was at a particular spot on the forearm or on one of the individual fingertips, by assessing the vibrations sent throughout the body by the tap." The detection of tap location is remarkable – a single sensor, that picks out location based on the characteristics of the body's reverberation from the tap.
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EA Sports Active 2.0: for iPhone, Wii, and PS3 (along with centralized online hub). That's a really, really interesting lineup of products – especially considering that there's going to be peripherals for all of them – and slices through a casual-games/casual-exercise market.