4 Kinetic Energy Start-ups
3. Lightning Packs
Muscle physiologist Lawrence Rome usually spends his days studying the way fish move and frogs jump. When the U.S. military asked him to find a way to convert movement into electricity, he came up with a backpack that slides up and down a frame as the wearer walks or hikes along a trail, generating enough electricity to charge an iPhone after a half and hour of walking. Rome has two contracts to develop a military version of the pack and hopes to have a consumer product ready to sell within two years; it will retail for more than $300.