My girlfriend Susan and I had been driving across the USA, East coast to West coast for three days. It was midday and we had been on the road since 5am. It was hot, very hot, and the air conditioning in the car was broken. It was cold and dark when we left this morning so we had both put on a long shirt and jeans.I looked over at Susan and noticed her wiping her brow, "You are sweating like a pig." I said as I watched her...