[hw97karbine] has made a pretty cool tennis ball cannon. While making a cannon of this sort is nothing new to us, we were impressed by the effort taken to get a stoichiometrically ideal mixture of ...

While there’s always some subjectivity in visual perception, some colors are supposed to be constant. Oranges are always orange. Fire trucks are always red. Tennis balls are always yellow. Or ...

For nearly a century, tennis balls were white or black. It wasn’t until 1972 that tennis balls took on their bright neon hue. At the time, Attenborough was working as a studio controller for the ...

If you've got a few tennis balls laying around not earning their keep on the court, you can put them to work around your home. Check out some (more) novel uses for tennis balls. Photo by S. Diddy ...