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The largest kidney stone on record weighed more than a kilogram and was 17 centimeters in diameter. The patient didn't actually swallow a coconut-sized stone; kidney stones form inside the body. So how do they grow in the first place? And why is it so painful to pass them? Arash Shadman shares the science behind kidney stones. Lesson by Arash Shadman, animation by Biljana Labović. Watch the full lesson at: https://ed.ted.com/lessons/what-cause...