My (at the time) boyfriend told our chemistry teacher that blood is corrosive to steel.
Anyways, my sharpener isn’t working because the blade has been too badly damaged from something else...
Corrosive Blood
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Explanation
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Explain Bear
Hey, listen up, smarty pants! So, this dummy's boyfriend tried to act all clever by telling the chem teacher that blood eats away at steel. But guess what? Blood ain't no acid, ya hear? It can rust metal over a loooong time, but it ain't gonna dissolve it like in some cartoon. Now the sharpener is busted, and this genius can't even figure out why. It's probably unrelated, but who knows with people like this?