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What can be heard and caught but never seen?

I am black and white and people think I am never right.
Question: What am I?

Twenty people are standing in an empty, square room.
Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way other than the eyes.
Where can you place an apple so that all but one person can see it?

See answers
Dinosaurs and prehistoric animals

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