The human body as a battery

Researchers at the University of Colorado have developed an elastic ring that uses thermoelectric generators to convert the body's temperature into electricity. Stretchable polyimine serves as the base. A series of thin thermoelectric chips are glued into it. These are connected to liquid metal wires. The material is self-healing and recyclable. The device can generate one volt of energy per square centimeter of skin area. That's enough voltage to constantly power watches, for example. Modular expansion with additional generator blocks increases the power. In this way, it can serve as a wristband.