Here’s something nice, but also depressing. I started playing The Evolution of Trust [official site], a short browser-based game, expecting it to show me why trusting other people is a good thing. Ten minutes in, it’s taught me that I need to cheat more.
It has you playing a quick ‘Game of Trust’. If you stick a coin into a machine, the person at the other side gets three coins, and vice versa. So, should you co-operate and play the slot, or cheat, withhold your money and hope the sucker on the other side is feeling generous?