ARTHUR C Clarke said that any sufficiently advanced technology is indistinguishable from magic.
In that case, let me take you behind the Wizard’s curtain (which sounds rude, now I read it back) to watch a fascinating video on Skinput.
Basically it uses the acoustic properties created by tapping different parts of your arm (which have different bone and muscle density) to control tech. This is awesome stuff. Thanks to @digidickinson and the Huffington Post for the heads up.
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- Turn Your Body Into Your I/O with Skinput (video) (singularityhub.com)