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Memory can bring past experiences back to mind, but it cannot reveal events that have not happened.
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Related riddles
Two doors have two guards. One guard always lies, the other always tells the truth, and one door leads out. You may ask either guard one question. What do you ask?
Type:What Am I?
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The answer is
Ask, “Would the other guard say this is the exit?” then choose the opposite door.
What lamp makes a room darker when you turn it on?
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The answer is
A lamp in a photo editing app using a dark filter.
Three cups sit in a row. The first two are full and the third is empty. How can you make them alternate full, empty, full by touching only one cup?
Type:What Am I?
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The answer is
Pour the second cup into the third cup.