

Batteries don’t generate electricity, they store it. And human fat actually is much more energy dense than the lithium ion batteries we have today. It’s almost as energy dense as gasoline, but there aren’t any animals that produce gasoline naturally. So if the robots needed a good way of storing excess energy (solar?) until they needed it, and they hadn’t made any big battery advances by then for some reason, human bodies wouldn’t be a terrible option if you had a good way to fatten them up when you had excess energy and have them burn the fat and turn some turbines when needed.














But you see, the key to the trick is that size has nothing to do with it, nor does weight. It’s all about relative densities. The orange is almost entirely water, with just enough other stuff in it to make it sink. Even a bowling ball will float in water if it weighs less than 12 lbs.