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Boeing removed every fastener on each of the five circumferential joins on all of those airplanes, about 2,000 fasteners for each join, and measured the gap at each hole — a so-called “through-hole” inspection.

On a convex or tubular structure such as the outside surface of a blood vessel, cells tend to move circumferentially around the shape.

"It is the view of the FIA and Pirelli that a significant number of additional laps on these tyres could result in circumferential damage of the tyres, leading to failure," it said.

Metro supported the Wilson Bridge’s rail-ready redesign and, in 2001, publicly shared “conceptual” plans for running trains across the span as the start of a circumferential rail line, according to a Washington Post article.

The subsequent eye exam then “revealed circumferential spoke-like iris transillumination defects in both eyes,” the report’s authors, from the University of Texas Medical Branch at Galveston, wrote.