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Every human is a biodegradable battery of kinetic energy. So for what its worth, parent comment is technically correct.

We've got plenty of chemical energy stored in fat and sugar too :)

I eat food to charge and can store that energy as fat.

The Matrix begs to differ(I saw it in a movie so it must be true).

"Listen to me, coppertop. We don't have time for twenty questions. Right now there's only one rule, our way or the highway." - Switch, _The_Matrix_