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Radiocarbon dates do not tell archaeologists exactly how old an artifact is, but they can date the sample within a few hundred years of the age.

If two nuclei have different masses, but the same atomic number, those nuclei are considered to be isotopes.Carbon-14 is radioactive and undergoes radioactive decay.Radioactive materials contain some nuclei that are stable and other nuclei that are unstable.This is a digitized version of an article from The Times’s print archive, before the start of online publication in 1996.To preserve these articles as they originally appeared, The Times does not alter, edit or update them.

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Tell students to design their own experiment, using paper, M&M’s®, Pennies, other 2 sided material or Licorice as a radioactive material undergoing decay to discover the nature of the half-life of that material.