The rules of evolution are simple: (1) if a trait makes survival or breeding more likely, then that trait will tend to survive in the long term by being passed down the generations. (2) Gene mutation and gene mixing create new traits, which naturally vary in how much they promote survival. Yet, the consequences of these simple rules are profound. Various facets of the world are hard to understand without taking evolution into account. Since our brains and bodies (as well as the natural world...