Three closed doors stand in front of you.
Behind one is a brand new Ferrari.
If you choose the correct door hiding the Ferrari you win the car.
Behind the other two are goats.
You point to one but don't open it.
A little man called Monty Hall opens one of the other two doors that you did not select to reveal a goat.
You have the choice to open the door you pointed to or switch choices and open the other door.
Should you change your mind or stick to the same door or does it make no difference?
Don't try and work this out at four in the morning as I did. To play the game and see why you should switch doors see this great piece on the New York Times website.
PS The reason it is interesting is that someone has applied the same type of thinking to studies of cognitive dissonance theory and but a big dent in the whole subject - a bread and butter part of any psychology degree.
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