Get me a piano teacher, stat! When I was a child, my father, enchanted by the notion that I might someday provide live piano accompaniment to his evening cocktails, signed me up for lessons with a mild-mannered widow who—if memory serves—charged 50¢ an hour. Had I only been forced to practice more regularly, I’d have no trouble remembering the exact price of these lessons. My memory would be a supremely robust thing of beauty. Ditto my math skills, my cognitive function, my ability to multitask.