Sometimes I am not, as they say, the sharpest knife in the drawer. The other day Sean and I were have a quick bite to eat at Davidson’s. He was telling me about one of the books he is reading by Jon Katz. He was trying to explain how a couple of sheep can pretty quickly get to be a lot of sheep. “So they start with a couple of ewes and a ram.” “Uh-huh.” “And the ewes start having babies, maybe a set of twins.” “Ok.” “Then those ewes begin having babies.” “Which ewes?” “The new ewes.” “From the ram?” “Yes.” “You mean a new ram and the second ewes?” “No, the old ram and the new ewes.” “That can’t be, they’d have…