Recently two of my out-of-town friends had birthdays and as both are serious readers I thought they’d enjoy a good book I’d just read. So I bought two more copies, wrapped each for mailing, and headed for the post office where I found John my favorite postal guy behind the counter. “I’ll send them book rate.” he said putting the first one on the scale. “It’ll be $4.95.” And so I took out a $10 bill to cover the anticipated postage for two. Then John put the second book...