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Over time, the amounts of Pb-206 and Pb-207 will change in some samples, as these isotopes are decay end-products of uranium decay (U-238 decays to Pb-206, and U-235 decays to Pb-207).
This causes the data points to separate from each other.
Have you ever wondered what the banknotes of Jamaica look like?
Collecting world paper money is a wonderful way to learn about geography, anthropology, economics, mathematics, politics, art, and even biology.
Unfortunately, the age cannot be computed directly from material that is solely from the Earth.