Crowd noise at the new Cape Town Stadium built for this summer's World Cup won't be heard by area neighborhoods. That's because the stadium has a 398,265-square-foot roof consisting of 9,000 half-inch-thick glass panels, arranged in a ring above the stands, and a Teflon and fiberglass mesh below the glass. The combination reflects crowd noise back onto the field and prevents it from escaping through the roof's central hole.

Full Story:
Popular Science

Related Summaries