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Yet, you’ve heard the news: Earth is 4.6 billion years old. That corn cob found in an ancient Native American fire pit is 1,000 years old. Geologic age dating—assigning an age to materials—is an entire discipline of its own.

In a way this field, called geochronology, is some of the purest detective work earth scientists do.

The majority of the lesson focuses on radiometric dating, including an activity where students date their own "rocks and fossils".

Basic understanding of how radiometric dating works is useful.

Picture a swimmer competing in a 1,500 metre race and an observer with an accurate wristwatch.

We note that at the instant the swimmer touches the end of the pool our wristwatch reads and 53 seconds.

This lesson is highly simplified, and the powerpoint describes everything the student will need to know for the activity.

Many people assume that the dates scientists quote of millions of years are as reliable as our knowledge of the structure of the atom or nuclear power.

Part 2 explains how scientists run into problems when they make assumptions about what happened .

For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain.

Later called Ötzi the Iceman, small samples from his body were carbon dated by scientists.

How long has the competitor taken to swim the race?

When I have asked an audience this question they have looked at me incredulously and said, “Starting time?

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