When I was younger, I used to wonder where money had been, who held it, what they bought with it, etc. I know, I was a strange child. As I grew older and saw the disgusting things people do with money (put it in their socks, their underwear waistbands when jogging etc) I tried not to think about where my money had been or whether I should spray it down with bleach before touching it. Anway, I remembered seeing a website that allowed you to track your dollar by its serial number and showing it to my kids. We had fun with it, then they lost interest.
Now there’s a similar program for book lovers. BookCrossings allows people to register any book in their personal library and leave it somewhere for someone else to pick up and read. I think this is a fun idea and I plan to sign up. I just hope I don’t pick up a book that’s been in the waistband of someone’s sweaty tighty whities.