Quantum Mechanics and Stupidity

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What is the difference between  Quantum Mechanics and Stupidity? I said this almost a decade ago, and I'm writing this down for your convenience.
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 "Doing the same thing over and over again and expecting a different result is stupidity defined."
- Conventional Wisdom

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on the other hand
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"Doing the same thing over and over again and expecting a different result is quantum mechanics defined." 

- Thads Bentulan aka Street Strategist
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