Intel is researching technology to harvest free energy from the environment, which could lead to devices such as mobile phones running for indefinite periods without recharging. The company said it was working on tiny sensors that could capture energy from sources such as sunlight and body heat. In the future, such energy could be used to power personal electronic devices such as cell phones. Recharging themselves by scavenging free energy allows the sensors to continuously record and transmit readings over wireless networks, without any human involvement. Read more.