Here’s just one of many examples from an experiment at Northeastern University: Subjects were told they should flip a coin to see who should do certain tasks. One task is long and laborious; the other is short and fun.

The participant flips the coin in private (though secretly watched by video cameras), said David DeSteno, a professor of psychology at Northeastern who conducted the experiment. Only 10 percent of them did it honestly. The others didn’t flip at all, or kept flipping until the coin came up the way they wanted.

Trying to become more ethical — or teaching people how to — would seem doomed then. But that’s not true. It’s just that how we teach ethics has to catch up with what we know about how the human mind works.