How do scientists determine the age of dinosaur bones?

The bone was 68 million years old, and conventional wisdom about fossilization is that all soft tissue, from blood to brains, decomposes. Only hard parts, like bones and teeth, can become fossils. But for some people, the discovery raised a different question.

How do scientists know the bones are really 68 million years old? Today's knowledge of fossil ages comes primarily from radiometric dating, also known as radioactive dating. Radiometric dating relies on the properties of isotopes.

These are chemical elements, like carbon or uranium, that are identical except for one key feature -- the number of neutrons in their nucleus. Usually, atoms have ... more.

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