Without a complete megalodon skeleton to measure, these figures are based on tooth size. Megalodon teeth can reach 18 centimetres long. In fact, the word megalodon simply means 'large tooth'. These ...

It's time for some perspective.

What came first, the chicken or the egg? It's one of life's great mysteries because you can't have a chicken without an egg, but equally you can't have an egg without a chicken. This conundrum of ...