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Tennis balls didn’t get their distinctive neon hue until nearly a century after the game was invented.
Tennis ball - Wikipedia
Understanding Tennis Ball Pressure - OnCourt OffCourt Blog
Review of tennis ball aerodynamics - Mehta - 2008 - Sports Technology - Wiley Online Library
Tennis Balls Are Optic Yellow Thanks To David Attenborough (Cool Weird Awesome 550) – Brady Carlson
Tennis Ball Size & Information Guide
10 Unusual Uses for Tennis Balls : 11 Steps (with Pictures) - Instructables
Colored Tennis Balls History, Types & Uses [Guide]
Why is There Fuzz On the Outside of a Tennis Ball? - Basha Tennis
Are Tennis Balls Green Or Yellow?