What was the first man-made invention that could see through a wall?

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What do people spend a lot of money on every year but never want to use?

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The more I appear, the less you see. So riddle me this: What could I be?

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I start with S and end with IT, and have you in the middle. What am I?

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What is the mistake in the following list: ABCDEFGHIJKLMNOPQRSTUVWXYZ?

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