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Now it is time to put those math skills to good use.At one half-life, you would have approximately 50% Carbon-14 and 50% Nitrogen-14.

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The half-lives of several radioactive isotopes are known and are used often to figure out the age of newly found fossils.

Different isotopes have different half-lives and sometimes more than one present isotope can be used to get an even more specific age of a fossil.

Below is a chart of commonly used radiometric isotopes, their half-lives, and the daughter isotopes they decay into.

Let's say you found a fossil you think to be a human skeleton.