A worker angrily removed the support plate under a manhole cover, smashed it against a metal post, and threw it aside, but as soon as he left, the plate returned to its original spot. Abroad, skateboarders performing tricks in public often annoy passersby, so cities install small metal stoppers on stairs, railings, and benches to block them. Yet these barriers are hardly effective—skaters can tear them off with force, or use tools like screwdrivers and pliers. For seasoned skaters, such devices

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