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James Dyson built 5,127 prototypes over 15 years to perfect the bagless vacuum. Every manufacturer rejected him. He mortgaged his house, nearly went bankrupt, and was told repeatedly that bags were fine. The 5,127th prototype worked.
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Canon
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Dyson: he couldn't control whether manufacturers would license his technology. He could control whether he built a better prototype. So he built 5,127 of them. Each one taught him something. By the time he was rejected by everyone, he knew more about vacuum engineering than anyone alive.
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