How many times it thundered before Franklin took the hint How many apples fell on Newton's head before he took the hint Nature is always hinting at us. It hints over and over again. And suddenly we take the hint. (Robert Frost)

How many times it thundered before Franklin took the hint How many apples fell on Newton's head before he took the hint Nature is always hinting at us. It hints over and over again. And suddenly we take the hint.

Robert Frost

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