# Only Logical People Will Be Able to Get This Simple Card Trick Right

## Warning: 9/10 people will get this wrong.

You sit down at a table and the man in tweed smiles. He introduces himself, lights his pipe, then lays four cards down carefully in front of you. The first card shows the number five, and the second card shows the number eight. The third card is simply blue, and the fourth card green. The man looks at you, and speaks bluntly.

“If there is an even number on one side of a card,” he says, “then the opposite side is always blue.”

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Here’s the thing: He’s probably lying. You know this, but now you have to prove it. Without turning any unnecessary cards, which cards on the table would you have to flip over in order to prove whether the man’s statement is true or false?

This game is called the “Wason selection task,” named for English psychologist Peter Wason (the kind gent who hypothetically just dealt the cards to you). And while it may seem easy, this card trick has been endlessly analyzed and replicated since its 1964 debut as a perfect example of just how illogical most humans actually are. The correct answer, it turns out, eluded 90% of test subjects in Wason’s original experiments—even when those subjects were given a second or third chance to try and solve it.

Do you have a logical mind? Try solving Wason’s puzzle now by clicking your answer in the interactive video below: