What an amazing and often surprising week we have had. But now it is time to start the long trip home. This morning before Vinh picked us up for the last time, I wanted to mail postcards. I've had several ready to mail for a few days, but have not seen a post office to get stamps. I thought we would see one while we were out, but we haven't, or we didn't recognize it as a post office. I went to the hotel front desk to ask where I could buy stamps. The clerk res...