You've probably heard that, 'diamonds are a girl's best friend', but diamonds also teach us an important lesson about the age of the earth. Diamonds are made of carbon. One rare type of carbon—known as carbon 14—is radioactive, which means that it breaks down over time. By measuring the amount of decay, scientists estimate how old something is. Some people think that carbon 14 dating proves things happened millions of years ago. But that is wrong, because carbon 14 decays so fast that something a million years old could not contain any carbon 14. Geophysicist Dr John Baumgardner recently investigated...
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