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seen Mar 27 '11 at 13:14

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awarded  Nice Question
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awarded  Notable Question
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awarded  Popular Question
Mar
26
awarded  Scholar
Mar
26
accepted How do we know that some radioactive materials have a half life of millions or even billions of years?
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26
awarded  Supporter
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awarded  Student
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asked How do we know that some radioactive materials have a half life of millions or even billions of years?