What colour do you think these tennis balls are? - BBC News
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Roger Federer weighs in on the debate as people are divided on whether tennis balls are yellow or green.
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Sorry, What ― David Attenborough Is The Reason Tennis Balls Are
The reason tennis balls are yellow is largely thanks to Sir David
Why Tennis Balls Are Yellow, Thanks To Sir David Attenborough
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Why tennis balls are yellow is largely thanks to Sir David
