My dad belonged to a group for smart people called Mensa. As a child I imagined the meetings as a bunch of guys standing around talking logarithmic equations in their white short-sleeved button-down shirts with skinny ties, with pens protruding from their pocket protectors. Maybe a slide rule poking out of a back pocket. My dad had to take a test to get into Mensa. Mensa means “table” in Latin. There are now about 134,000 members around the world. My dad was very proud of the fact that he had been tested at a 165 IQ or maybe 190, and he was obviously a card-carrying Mensa member. I mean, really.…