Outrageously funny, Plato and a Platypus Walk into a Bar . . . has been a breakout bestseller ever since authors-and born vaudevillians-Thomas Cathcart and Daniel Klein did their schtick on NPR's Weekend Edition. Lively, original, and powerfully informative, Plato and a Platypus Walk Into a Bar..... is a not-so-reverent crash course through the great philosophical thinkers and traditions, from Existentialism (What do Hegel and Bette Midler have in...