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.
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.
The polymeric materials in new tennis balls have a higher coefficient of restoration, so they tend to spring back into shape easier. With time and exposure to atmosphere, the compounds that keep the ball soft volatilize and leave into the atmosphere.
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.
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
This is an old experiment. Neither. Both balls have the same velocity as gravity draws on them equally.