Ergh. Gosh, Facebook is a time-sink. Half my morning just evaporated when I should have been focusing on my slowly melting writer-life. Fortunately, this time, the conversation was awesome—a proper nerd-debate about multi-level selection theory. And if you can’t have a proper chewy discussion in your life from time to time, what does it mean to be alive? Challenge is fun. The dullest conversations are the ones where everyone agrees.