Money to shred?

Kids are funny about money, they think it's a magical thing that appears from nowhere. My daughter had a couple of dollars sent to her in a birthday card. Well being the carefree person she is, she left them out where her little brother could find it. My youngest had just observed his Dad shredding old papers over the weekend. So he of course decided he would do the same with the "paper" he found on the floor. My daughter caught him in the act, and her once whole dollar bill is now only worth about 50 cents!