A bat and ball cost $1.10. The bat costs $1 more than the ball. How much does the ball cost?

If you said $1.00, you need to read ’‘The Science of Irrationality’’. If you said $1.05, read it anyway. It will make interesting reading, and knowing how many of America’s top university students miss that seemingly simple question will make your day.

It’s a WSJ article available online to nonsubscribers for 7 days from the 17th of October. As a subscriber, I recommend joining of you wish to read it at a later date.