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Evans & Michael Feldman and directed by Sean Mc Namara.

This method for rock dating is based on the decay of potassium-40 into argon: until the rock solidifies, argon can escape, so it can in theory date the formation of rock.

One problem is that potassium is also highly mobile and may move into older rocks.

Things go terribly wrong when Raven makes Eddie mad, and he quits.

Raven embarrasses herself on the radio show, and does not know how to operate the machines.

"Radio Heads" is the thirteenth episode of the second season of Disney Channel's That's So Raven and the thirty-fourth episode overall. It was written by Dennis Rinsler and directed by Rich Correll.

When Eddie hosts a radio show at school, with Raven as a guest/co-host, Raven and Eddie clash over hosting duties.

Meanwhile, Cory lies about a babysitter being with him, so that he can have the house to himself.

Cory is happy at first, until he sees a late-night horror movie called Eye of the Zombie 2, and he becomes scared.

The half-life of carbon-14 is approximately 5,730 years. Since the quantity represents 13% (or 13/100ths) of , it follows that This is based on the decay of rubidium isotopes to strontium isotopes, and can be used to date rocks or to relate organisms to the rocks on which they formed.

It suffers from the problem that rubidium and strontium are very mobile and may easily enter rocks at a much later date to that of formation.

In the end, Eddie forgives Raven, and she gives Eddie back his hosting duties.