We tested the new World Cup ball. This is what you need to know about how it will fly, dip and swerve by John Eric Goff, The Conversation edited by Gaby Clark, reviewed by Andrew Zinin Editors' notes ...

Every four years, the men’s World Cup delivers some certainties. The pitch dimensions are tightly regulated, offside is signaled with a flag, and referees end the match with a blast of a whistle. But ...