Body heat through flexible fabric could power IoT devices for health monitoring for people, pets, machinery
(PHYSorg.com Chemistry)

Wearable electronics and other Internet of Things (IoT) devices are rapidly growing in popularity, but their need for consistent power can place a high burden on users. One recently proposed solution is to generate electricity using heat from the human body, animals or other ambient sources, but typical emerging devices need to be up to an inch thick to harvest maximum results.