This is here because it's important.
In a changing world, you have to remember that we are still flesh and blood animals who have evolved over millennia.
We believe evolutionary psychology is the best way to understand human motivation.
It's a unifying factor, if you like, that helps explain all the crazy, irrational things we do that behavioural psychology explains.
For great introductions to evolutionary psychology, read Stephen Pinker's The Blank Slate, or — our favourite read — Geoffrey Miller's Spent.