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Answer: Zinedine Zidane
Answer: Pitch dimensions
Answer: He held dual citizenship through ancestry
Answer: Identifying players
Why: Arsenal and Chelsea wore numbers on 25 August 1928, but the FA ordered the experiment dropped; numbering became compulsory only in 1939.
Answer: Maintaining the ten-yard gap
Why: Football's lawmakers approved the foam in 2012 and it reached the World Cup in 2014, yet the Laws still list it only as optional referee kit.
Answer: Olympic goal
Why: Cesáreo Onzari scored the first one in 1924 against Uruguay, who were the reigning Olympic champions, and the name stuck.