If you had to wear a knee brace every day you’d definitely want to wear one of these.

Funny how these simply wonderful ideas elude us for so long :

By Will Dunham

WASHINGTON (Reuters) – Talk about a knee-jerk reaction. Scientists in the United States and Canada said on Thursday they have developed a unique device that can be strapped on the knee that exploits the mechanics of human walking to generate a usable supply of electricity.

It generates enough power to charge up 10 cell phones at once, the researchers report in the journal Science.

you can [read more of the reuters article] too.

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