Always Running
What runs but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?
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Medium
What becomes more valuable the more it is broken?
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Four people need to cross a bridge at night. They have one torch. The bridge can only hold two people at a time. Person A takes 1 minute to cross, B takes 2 minutes, C takes 5 minutes, and D takes 10 minutes. How can they all cross in 17 minutes?
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A king has 1000 wine bottles, and he discovers that one is poisoned. He has 10 prisoners to help him identify the poisoned bottle. The poison takes effect exactly 24 hours after consumption. How can he identify the poisoned bottle in just one day?
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A prisoner is told he will be hanged on a morning when he will not expect it. He reasons he cannot be hanged, but he is. How?
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You have 12 identical-looking coins, but one is either slightly heavier or lighter than the others. You have a balance scale and can use it only three times. How do you identify the false coin?
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A king wants to send a message to his ally. The message must pass through several kingdoms, and each kingdom will keep a copy. How can he ensure the message is not altered?
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