Ever found a lost wallet?

You know, you're walking along and there it is on the street: a wallet.

You pick it up and see there is money in it, and maybe a business card.

Do you turn it in? Try to return it? Or keep the money.

     NPR has a great story about a sociological experiment in which 17,000 wallets were dropped all around the world. How many were returned? And did the amount of money make any difference? (Yes. The more money, the more likely it would be returned. What? Here's the NPR story.