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Oct
23
awarded  Nice Question
Aug
6
awarded  Notable Question
Feb
28
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?
Mar
26
awarded  Supporter
Mar
26
awarded  Student
Mar
26
asked How do we know that some radioactive materials have a half life of millions or even billions of years?