Yes, I saw that report, brilliant girl. I was thinking about stuff that takes microwatts or milliwatts like watches or blood pressure, glucouse readers and the like. Clearly you are not going to get watts out of such devices, only milliwatts. I like the idea for a watch since I have had experience with both solar powered watches which works fine as long as you subject the watch to light but on your wrist you are not going to get much light to harvest and so it dies after a few months like that unless you physically take off the watch and set it out in the sun for a few hours.
Or just battery power but the one I use (casio) has a 60 kilohertz reciever inside which picks up the time signal from Fort Collins Colorado and I am sure it takes quite a bit more energy to run 24/7 than the rest of the electronics in the watch, still milliwatts but the battery dies in under 2 years and much less in my experience. Human body heat to power such a device would mean you just wear it and get power renewable.