This new device, which is currently in development at Carnegie Mellon, will allow users to control devices by tapping parts of their arm/fingers. It is currently a strap that goes on your bicep, but they hope to get it down to the size of a watch. In the video they demonstrate how a user could tap parts of their forearm to control an MP3 player, and also how a game like Tetris can be controlled by tapping one’s fingers.
This is the device (Skinput) that straps to your bicep
With things like the Playstation Move coming out, 3D Televisions, and then this, the future looks like it’s going to have some crazy technology. I guess that alien technology is getting out…
/exit MIB reference
New Tech Turns Your Skin Into a Game-Controlling Touch Pad (Kotaku)