Biomechanical energy

Knee dynamo taps 'people power'

power, energy, Biomechanical energy
US and Canadian scientists have built a novel device that effortlessly harvests energy from human movements.
The adapted knee brace, outlined in the journal Science, can generate enough energy to power a mobile phone for 30 minutes from one minute of walking.
read full article via BBC http://news.bbc.co.uk/2/hi/technology/7226968.stm