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The time it takes for half of the original sample of a radioactive isotope to decay.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
The time it takes for half of the original sample of a radioactive isotope to decay.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> [[Liberals]] believe that half-lives are constant over time while [[Young-Earth Creationists]] believe that half-lives are not constant because radiometric dating using half-life measurements indicate an Earth and Universe that are billions of years old.