The Riddle That Seems Impossible

The 100 Prisoners

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You're a bank robber trying to escape from jail. Can you solve

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Four friends claim they have been wrongly imprisoned. They are not criminals but mere harmless logicians! The warden says, "If ...

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Do you think you can call yourself

An evil logician takes Alice and Bob captive. They have a chance to escape if they can deduce the total number of trees in the ...

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Sign up for our newsletter and never miss an animation: http://bit.ly/TEDEdNewsletter One hundred green-eyed logicians have ...

Thanks to Rahul for the suggestion! A hospital has 16 rooms in a 4x4 grid. The rooms are numbered row by row and rooms and ...