Ordinary dating method

So, we have a “clock” which starts ticking the moment something dies.

Rocks of Precambrian age had only the rarest wisps of fossils.

The work of geologists is to tell the true story of Earth's history—more precisely, a story of Earth's history that is ever more true.

A hundred years ago, we had little idea of the story's length—we had no good yardstick for time.

Familiar to us as the black substance in charred wood, as diamonds, and the graphite in “lead” pencils, carbon comes in several forms, or isotopes.

One rare form has atoms that are 14 times as heavy as hydrogen atoms: carbon-14, or C ratio gets smaller.

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