Carol tried to tap into my recently acquired travel expertise by asking about currency exchange. “When you use your credit card, do you pay in dollars or euros?” I thought it both an astute and practical question. Unfortunately, I had no clue which method was more sound monetarily. “I choose dollars, but I don’t know why,” I replied with an incurious shrug. Carol hasn’t realized it yet – or maybe she has – but she is the resident expert on practical matters for this trip.