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Modern roped rock climbing, one of the nerdiest sports, relies almost entirely on a single type of knot for safety: the figure eight knot. It’s been said that the knot has never failed, and is taught to every beginning climber on the planet. But what makes this knot so strong? Kyle once again explores the physics of his favorite sport.

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“Changes” (https://meydan.bandcamp.com/) by Meydän is licensed under CC BY 4.0 (https://creativecommons.org)