American and Canadian boffins have come up with a clever idea. It’s a little knee brace that generates electricity as you walk. Just like wearing 100% polyester trousers.
Apparently capable of building up enough of a charge to power a phone for 30 minutes from just one minute of walking, the invention is designed to help people with complicated prosthetics power their complicated fake limbs.
How it works is all exceeding complicated. It’s something to do with the acceleration and deceleration of muscles being used to… I’m out of my depth already.
If you really want to know about it head off to the BBC – they explain the whole process much better than I ever could without resorting to blatant cutting & pasting.