What is it about old people that makes them smell like mothballs? Nobody really knows. But some folks do know how to calculate the ages of various rocks, fossils and trees.

It seems like the world only just recovers from one end-of-the-world event and then we're onto another one. How do we keep up? This time it's the sinister Mayan calendar and the blockbuster film 2012.

Quiz. Yep.