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Common Answers

Have you entered September's Common Answers?

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Difficulty: Easy

Puzzle Details:

If you have two identical screws and arrange them such that their threads touch each other with their heads facing away from each other.

Screw one screw and unscrew the other.

What happens?

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[Ref: ZJOE]  

Answer: Nothing.

One screw tries to get closer to the other at the same rate that it gets away.



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