Dating more than one man

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Most of the elements in nature are stable and do not change.However, some elements are not completely stable in their natural state.

Once all of the sand has fallen out of the top, the hourglass will no longer keep time unless it is turned over again.Similarly, when all the atoms of the radioactive element are gone, the rock will no longer keep time (unless it receives a new batch of radioactive atoms).The rate of loss of sand from from the top of an hourglass compared to exponential type of decay of radioactive elements.He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.

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