Introduction

Ollie: Evolution answers two questions. One is how did it get that way? And the other is, why does it work the way it does? When we come across some complex biological system, whether it's anatomical or psychological, we always want to know why it is the way it is. The great evolutionary biologist Theodosius Dobzhonski famously said nothing in biology makes sense except in the light of evolution. If you are a creationist, in which case the answer is God.