Shout one word into a tunnel and I return that word late, weaker, and with no idea what it means. What am I?

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Hint: Hard surfaces send the sound back.

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The answer is

An echo

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An echo is reflected sound. It repeats the shouted word after a delay, loses strength, and carries no understanding of the words.

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The more kitchens copy me, the more meals I can make; hide me in a drawer and I feed nobody. What am I?

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The answer is

A recipe

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What empty cup can fill a whole room?

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The answer is

A cup used as a speaker or echo toy.

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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?

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The answer is

Ask, “Would the other guard say this is the exit?” then choose the opposite door.

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