eli5 How does razor blade dull on hairs when razor blades are made of steel and they are much higher on mohs scale?
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The edge of a razor blade is very thin. And some research suggests that microcracks in the metal and the act of shaving hair causes the metal to chip and dull.
https://www.npr.org/2020/08/06/898577234/cutting-edge-research-shows-how-hair-dulls-razor-blades
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