CONFESS: I AM A WANDERLUST AT HEART. And so, four summers ago, I began packing for a trip. My younger sister, angel that she is, generously offered to help me pack my luggage. The motley array of potpourri in my suitcase left her thoroughly confused: Shirts, slacks… and a stethoscope. Tourist guidebooks, tickets for my flight, … and a textbook. A passport … and prescription antibiotics.