Energy can never be created or destroyed. Instead, we convert it from one form to another. We convert electrical energy to heat energy in our toasters and we convert wind energy to electrical energy using wind turbines. But what about the energy that our own bodies produce, is there an efficient way of harvesting it?
We eat our dinners, which are digested into their basic components (sugars, carbohydrates, proteins etc.) to produce chemical energy. We then convert this chemical energy into useful energy to go about our everyday lives. "