Speak to professionals from various disciplines and you will notice something funny: Even when they are off duty, they tend to view the world through the lens of their professional background. For example, a psychiatrist at a dinner party might pause to think a bit about the possible neuroses of the guests. A police officer might scrutinize an ordinary scene — and the people present — for any sign of illegal activity. It's not that they will do anything about it or even speak their mind, but I bet that's what goes on in their heads — it's the same with evolutionary biologists.