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Uranium Thorium Helium Dating Helps Solve an Early Problem
19th century physicists knew that the earth constantly loses heat to space, which is cold. By measuring the rate of lost heat and extrapolating backward to when every rock on earth was molten they could estimate the date of origin. But darwin's theory of evolution required more rthan 20 million years for life forms we see to day to evolve. Uranium thorium helium dating helps solve an early problem, tthe edge of the arth.