The 'people who fetch the tennis balls' are called ball boys and ball girls. The ball boys and ball girls are usually under 18 years old, with some being as young as 10 or 12 and others being as old as 16.
New tennis balls are considered fresh and not "flat". Old tennis balls exposed to play and air become flat and do not perform normally in a match.
The centers of tennis balls are rubber and rubber hardens with age.
Give them to someone with a dog.
Tennis balls are very useful for more than just tennis. Old people put them on their walkers, and people throw them to their dogs. But tennis players use them for, well, tennis. I think the biggest market would be rackets and re-stringing them.
Before television was invented, tennis balls were white. They would have remained this way if television had not been broadcast on live TV This was because people couldn't see the white tennis balls flying across the screen. So, they were changed to neon green/yellow so that viewers could see them.
New tennis balls bounce higher than old tennis balls because they have more elasticity and air pressure which allows them to compress and decompress more easily upon impact with the ground. As tennis balls are used, the felt covering wears out and the air inside the ball escapes, leading to less bounce.
They improved them a lot! If your question would be more specific, it would be easier to answer. The tennis balls used to be wads of hair or wool wrapped in stuff, but now they are more rubbery for bounce. I don't know exactly how.
A new tennis ball will bounce higher. Old tennis balls are considered "dead."
there is no such thing as a type of ball python... but there are morphs of them.
Liza was 10 years old during the filming of "Fetch! with Ruff Ruffman."
Some people said that tennis are invented in old Greece. Birth of modern tennis game (as we play today) was in 19th century.Major Walter Wingfield introduce Real Tennis.
because the people use to suck balls and and horse and balls