An intriguing new study found that people across the world are more inclined to give back a lost wallet if there is money inside.

It's obvious: Someone finding a lost wallet is less likely to return it if money is inside, right?

That's what top economists, as well as regular people, usually predict, given what most of us assume about human nature. But according to a clever new study involving thousands of people in 40 countries, what most of us assume about human nature is wrong.

The three-year study, possibly the largest real-world test of whether people behave honestly when