DARPA is developing technology that can use the kinetic energy generated by the human body’s movement or the thermal energy generated by the difference in body and ambient temperatures to power batteries for electronic devices like contact lenses that can serve as HUDs or augmented reality devices. My first reaction is whoa. My second is the same as the Slashdot poster, who said: “If I remember the movie correctly, this didn’t turn out so well for the humans.”