Hidden within North America is a long-forgotten continent once ruled by a bizarre cast of dinosaurs – but only a handful of fossils have ever been found.

We tend to associate dinosaurs with ground-shaking roars, but the latest research shows that this is probably mistaken and they probably sounded very different.

Sixty-six million years ago, our ancestors lived through the most violent event in the Earth's history. How did small, insignificant mammals survive a doomsday asteroid?

How can you increase your chances of becoming a fossil? Richard Fisher decided to find out.