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Scientists look at half-life decay rates of radioactive isotopes to estimate when a particular atom might decay.

Until the 18th century, this question was principally in the hands of theologians, who based their calculations on biblical chronology.

It might take a millisecond, or it might take a century. But if you have a large enough sample, a pattern begins to emerge.

It takes a certain amount of time for half the atoms in a sample to decay.

The isotope potassium-40 (k-40) decays into a fixed ratio of calcium and argon (88.8 percent calcium, 11.2 percent argon).

Since argon is a noble gas, it would have escaped the rock-formation process, and therefore any argon in a rock sample should have been formed as a result of k-40 decay.

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