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06-Nov-2017 08:41

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Using fossils as guides, they began to piece together a crude history of Earth, but it was an imperfect history.

After all, the ever-changing Earth rarely left a complete geological record.

Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.

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He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.

The state of physics today is like it was when we were mystified by radioactivity.

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