Admit it, you're curious: This is how cow poop becomes energy.

An unexpected energy source may be hiding in plain sight.

Let’s get straight to the facts: A dairy cow produces around 112 pounds of wet manure every day.

Even on a farm with only 187 cows (the U.S. average), that’s nearly 21,000 pounds of cow poop every single day.

Cows produce around 112 pounds of wet manure every day. Image via iStock.

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Gates Foundation: The Story of Food

Why are we all so prim and anxious about the sounds, smells, and substances that emanate from our keisters?

The obvious answer is that, well, poop and farts are gross. It is waste, after all, and full of (potentially harmful) bacteria. That's why other people's farts always smell worse than our own: to warn us of the impending intrusion of intestinal insalubrity.

But there must be another reason for our rear ends' rude and ribald reputation, right? Well, as it turns out, there's a lot of cruddy history behind our shame.

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