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In 1747 a ship's doctor named James Lind tackled scurvy. He took 12 sick sailors and split them into six pairs, giving each pair a different treatment. The citrus pair recovered. It was one of history's first controlled experiments — and it revealed what centuries of guesswork hadn't. The insight wasn't the cure; it was the METHOD. Before you can trust a result, you need a fair test: a control group, random assignment, and rules that stop you from fooling yourself.