Are you sick and tired of wasting potentially tens of calories suboptimally chewing? If so, a pair of researchers from Montreal, Aidin Delnavaz and Jérémie Voix, have a solution: the piezoelectric chin-strap.
All you have to do is chew and talk and grind your jaw as per your usual doses of coffee and 5-Hour Energy, and the device provides tiny bits of juice that might be used to power hearing aids, wearable electronics, or some so-far unrealized implantable device of the cyborg future. And if you’re already a cyborg, why not just go for it, eh?
I think riding a bike to generate electricity would produce more, and be better exercise.