The Skeptical Teacher

Musings of a science teacher & skeptic in an age of woo.

Self-Tying Knot Trick from TAM9

Posted by mattusmaximus on July 18, 2011

Well, I’m back from The Amaz!ng Meeting 9 in Las Vegas, and I’m slowly but surely getting caught up on things.  I just wanted to take a moment to share with everyone a trick I showed off during my “Skepticism in the Classroom” lecture at TAM9.  In this video, I show how to use a simple nylon rope to perform a *seemingly* mathematically impossible feat: having the rope tie a knot in itself without releasing either end of the rope. I show this to my students as a lesson in skepticism and critical thinking, and it never ceases to catch their interest.


Can you figure out the trick? Stay tuned to my Youtube channel for the solution ;)

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2 Responses to “Self-Tying Knot Trick from TAM9”

  1. [...] on how best to introduce skeptical content and critical thinking lessons into lessons and lectures. Matt’s rope trick was especially fun – free [...]

  2. [...] critical thinking exercises for your students: my “Uncle Harry” card trick, and my self-tying knot trick (the solution is here).   [...]

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