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If you don’t make mistakes, you’re not working on hard enough problems. And that’s a big mistake.
There are two possible outcomes: if the result confirms the hypothesis, then you've made a measurement. If the result is contrary to the hypothesis, then you've made a discovery.
"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors."
"What a treacherous thing to believe that a person is more than a person."