Years ago, I joked with a biology student that his long hours in the lab were spent breeding aggression into the local squirrels, who seemed a little too acclimated to people. Eventually, this escalated into an imaginary project to create Flying Attack Squirrels. (I guess you had to be there to see the hilarity.) Little did we know that just a few blocks away was a playground so rife with flying squirrels that it was named Flying Squirrel Playlot Park, apparently because flying squirrels’ range once extended this far west.