The Earth is really, really old. Over 4 1/2 billion years old, in fact. How do we begin to comprehend a number that large? It helps to put it on a more fathomable scale. Watch to see where Earth's ...

For most of us, the Pyramids symbolize the distant past. After all, they're more than 4,500 years old. But for geologists and paleontologists, they might as well have been built yesterday.

In this short film for primary schools Martin Hughes-Games describes the role of a palaeontologist; someone who studies ancient living things and how planet Earth has evolved over millions of years.