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Why Are There Razor Blades In My Walls? (2017x1)

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Many people have opened up the walls of old houses only to have an avalanche of rusty old blades fall out. Fifty years ago, nearly every bathroom had a medicine cabinet. At the back of the medicine cabinet was a tiny slot for disposing of use shaving razors. But the slot was actually nothing more than a hole in the wall. So, once you put something through that slot, there was no way to get it out.