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knot theory posts

Super strong pencil Activity

by David, 4 January 2017 | 0 comments

In this trick, you’ll wrap a shoelace around a pencil and a strip of cardboard. The string seems to pass straight through both, tearing the cardboard, but leaving the pencil untouched! You will need Pencil 2 rubber bands Thin cardboard Scissors Shoelace Some friends to impress

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Tie your shoelaces properly Activity

by David, 18 August 2016 | 1 comments

For many of us, tying shoelaces is something we learned long ago. And yet, a surprising number of people do their shoelaces incorrectly! So how can you tell, and how do you fix it? Read on to find out!   You will need Shoes with laces Diagnosing the problem Tie your shoelaces in a bow….

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Impossible plait Activity

by David, 23 September 2014 | 0 comments

A piece of felt that is platited into itself

You will need Felt sheet Good scissors Cutting the felt Cut a rectangle of felt about 6 cm wide and 20 cm long. Fold the felt in half so the short sides match up. Make two cuts, equally spaced, coming in from the folded side. Stop cutting about 2 cm before you reach the short edges of the…

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