Add Yahoo as a preferred source to see more of our stories on Google. Universal History Archive/GettyImages From airports to shopping malls, escalators are everywhere (so long as it's over more than ...
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Why do escalators have brushes on the sides?
From airports to shopping malls, escalators are everywhere (so long as it's over more than one floor, of course). And no matter where they are, or how many floors they traverse, most escalators have ...
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