DH walked by DS3 counting the keys on the piano this morning. He paused and watched until DS looked up and said, "There are 88!" A few moments later DS said, "There are really 91 on the piano." DH told him that he had it right the 1st time, to which DS replied, "There's 3 on the bottom." Ah yes... the pedals...

I'm not sure which surprised me more: the fact that DS gets 88+3 or that he has that amount of concentration.