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Vandaag is het 19 November 2018

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Nails - logic puzzle

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How can you put (without using glue or something like that) ten nails on the head of a standing nail? The final construction should be stable. spijker

Answer

In the following way, you'll build a stable construction:

First, put down nine nails like in the picture below.
spopl1

Then put one nail across.
spopl3

Lift the whole construction gently, and put it on the head of the standing nail.
spopl3
If you did it right, you'll see that this construction is pretty stable.