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How do you know a dated-at 1 million year old hammer wasn't 0.9999 million year old rock that was just made into a hammer in the last 0.0001 years?

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How do you know a dated-at 1 million year old hammer wasn't 0.9999 million year old rock that was just made into a hammer in the last 0.0001 years?	4061
How do you know a dated-at 1 million year old hammer wasn't 0.9999 million year old rock that was just made into a hammer in the last 0.0001 years	1