If one of your worst fears if becoming a human battery like in the Matrix no would probably be a good time to freak out. Thanks to Fujitsu we are one step closer to having human batteries. As mammals and living creatures in general we give off excess heat and Fujitsu wants to change his extra heat energy into usable energy for powering cars and such. Of course there is no sure way to see just how effective this is, but if you can get one on each human in the world it is not too much about efficiency as it would be about numbers. This is definitely a huge step into the future, but the question remains who would do this and if it will actually work practically.