Entropy Explained

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"# Entropy Explained Rudolf Clausius stares at his equations in 1850... and realizes he's looking at something nobody asked for. A measure of uselessness. Energy that's still there, technically... but can't do work anymore. He calls it entropy — from the Greek for transformation. And with that word, he names the tax the universe charges on every single thing that happens. Here's what gets me. Most laws of nature tell you what *must* happen. Gravity pulls. Light bends. But the second law of t..."