The dessert portion of today’s school lunch was a “mango stick.”  A thin slice of almost frozen mango in plastic-wrap.  God it was good.  Hoping to shock the fourth graders I was having lunch with, I asked them to guess how old I was the first time I had mango.    “Three.”    “Eight.”    “I was twenty-four.”    Cue the shock, disbelief, and questioning of everything they had ever learned about how the world works.  (Which, to be…