In countries like the US, oil is cheaper than water!
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“calories” are just a measure of energy.
The human body doesn’t need “energy”, it needs *food*. Uranium is full of energy too, but I wouldn’t suggest eating it.
Sometimes, people really want the body to be reduced to an equation, but it’s not. The body is a few billion years of evolution. It’s messy and complex and it’s evolved for a very specific niche in a very specific environment.
The human body is not an equation on a piece of paper where this much abstract *energy* is magically transformed into this much activity. It’s a biological entity which has the tools to extract energy from some very specific organic compounds and harness some of that energy to maintain itself and to move around.
You can’t feed it electricity or uranium or petrol or anything else, no matter how much energy that contains, just like you can’t power it with wind or sunlight, despite those too containing some form of energy.
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