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krattalak t1_iyf8xe8 wrote

OH!OH!OH! I know this.

When you pinch the ribbon and pull on it, if the force applied exceeds what's called the 'yield' force, it causes the outside of the ribbon to deform while the inside of the ribbon stays the same. This induces the curl.

There's actually a study on this. This was the topic of a SciShow video on youtube.

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SeaWitchK t1_iyfc0j6 wrote

I wish I had an award to give you for this comment!

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