THIS DAY IN SCIENCE: Penicillin Is Discovered - Sir Alexander Fleming in 1928

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What is entropy?

What is entropy?

  There’s a concept that’s crucial to chemistry and physics. It helps explain why physical processes go one way and not the other: why ice melts, why cream spreads in coffee, why air leaks out of a punctured tire. It’s entropy, and it’s notoriously difficult to...
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