Last year, right before publishing his illustrated children’s book The Magic of Reality, Richard Dawkins appeared at The New Yorker Festival and walked the crowd through a short thought experiment. Imagine pulling out your family genealogy. Now snap a photo of each ancestor going back 185 million generations. What would it show? First off, your very distant grandfather was a fish. Secondly, you can never put your finger on the very first human being, a proverbial Adam and Eve. 185,000,000 snapshots can never capture that one moment.