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Difficulty: EasyPuzzle Details

Question 7 on the local BrainBashers pub quiz was:

Name an ancient invention, which is still used in some parts of the world today, that allows people to see through walls.

What can this be?

Show Hint Show Answer Print Puzzle
[Ref: ZUAM]  

Hint: There are often lots of these everywhere you look.


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[Added September 1997]

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