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Every World Cup, Adidas introduces a new ball, and this year’s is called the Al Rihla. Joern Pollex/FIFA via Getty Images

World Cup: This year’s special Al Rihla ball has the aerodynamics of a champion, according to a sports physicist

Adidas releases a new ball for every World Cup. At the highest level of play, a ball that behaves in unexpected ways can throw players off. A sports physicist explains the science of this year’s ball.
Miami Dolphins quarterback Tua Tagovailoa runs onto the field before the team’s NFL football game against the Cincinnati Bengals on Sept. 29, despite a head injury during a game a few days earlier. (AP Photo/Joshua A. Bickel)

NFL player Tua Tagovailoa’s concussion might have been prevented with rugby’s stricter protocols

Miami Dolphins quarterback Tua Tagovailoa was carried off the field during a game on Sept. 29 after his second injury in only a few days, raising questions about NFL concussion protocols.

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