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Thanks for posting that. The image of the color changing fiber with the figure eight is a great visual to how rope is stressed differently because of bends. Whenever you bend a rope, the outside fibers of the sheath and core are under much more stress than the fibers on the inside of the bend. Rope is strongest in a straight pull. Same with webbing, it gets weaker when you introduce twists and bends. Luckily for recreational purposes these reductions in strength are nothing to worry about.

I also thought it was quite interesting what they said about knots with opposite twists holding better. I guess it makes sense, just never really thought about it.

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