While most researchers are trying to improve the touchscreen interfaces used on PC, cellphones and MP3 players, Carnegie Mellon University and Microsoft have developed a touch-interface for your skin. That’s really terrific! The ‘Skinput’ includes a micro-sized pico projector, which is embedded in an armband to beam an interface on the skin. But it actually uses an acoustic detector —which would match the sound frequencies with specific skin locations—to recognize which part you’ve tapped. The revolutionary technology also supports wireless applications like Bluetooth.