Scientists have developed the first self-powered nanogenerators that scavenge energy from their surroundings. They could someday replace conventional batteries in small electronics.
Even the slightest movement or vibration, such as a light breeze or the thump of your pulse, can provide enough energy for these nanogenerators. The energy is stored in a capacitor and used to power sensors or even a small wireless radio like those found in Bluetooth headsets. Signals from these wireless radios can be detected up to 30 feet away.