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There was no proof that man could fly to the moon before it was done.  There was no proof that man could fly at faster than the speed of sound until it was done.  There was no proof man could find a cure for polio until it was done. There was no proof that an atom could be split, creating a chain reaction until it was done.  There was no proof that a sheep could be cloned until it was done. There was not proof that time was not a constant until it was proved at a university with two atomic clocks, one spaced 74 feet above the other (one closer to the earth, subject to more of earth's gravity).