Vlogger and former NASA engineer Mark Rober arranged a rather wonderful experiment in which he and a number of co-conspirators casually dropped 200 identical wallets around towns and cities across the United States to see if people would return it or not. Each of the wallets contained a small amount of money, a picture-less ID card, a sonogram photo (“It’s a boy”), a picture of a puppy and a phone number to call if found.