Tennis Channel on Twitter: "Tennis balls used to be white...but why'd they change to "optic yellow"? #TennisDYK https://t.co/iM9RW9DStJ" / Twitter
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TIL tennis balls used to be white until Sir David Attenborough realized they'd be hard to follow on color television so the sport created "optic yellow" balls. : r/tennis
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How tennis changed from white to yellow balls thanks to David Attenborough - Tennis365
Why tennis balls are yellow -- or maybe green | CNN
30 years ago this summer, Wimbledon turned yellow - ESPN Front Row
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