At the Brookland-CUA Metro station one evening this year, a line of people trudged up the steps of a broken escalator. Rashaad Houston, a 27-year-old travel coordinator for NASA, took one look at the ...
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What those grooves on escalator steps are for
Watch why escalator steps are designed with teeth and what purpose they actually serve. While most people barely notice them, these small details play an important role in how escalators function ...
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