Engineer's Puzzle

Latest Puzzle: Screwing with my brain!

23/02/2017

This logic puzzle was first published in the US popular science magazine, Scientific American, in one of Martin Gardner’s regular brain teasing columns. It goes like this:

‘Two identical bolts are placed together so that their helical grooves inter-mesh as shown in the illustration. If you move the bolts around each other as you would twiddle your thumbs, holding each bolt firmly by the head – so that it does not rotate – and twiddling them in the direction shown, what will happen to ... Read More

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