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tennis would present a full-color parade of styles for the next four decades. What about the ball? It also became colorized in ’68. That year, Penn introduced what it called an “optic yellow ...

Are these tennis balls yellow or green? It seems a simple question - the tennis balls are obviously yellow. But some people say they are obviously green. And then there are the people who say they ...

A Reddit brain teaser featuring a tennis ball hidden in a pile of leaves has gone viral, highlighting the benefits of mental ...