Why Do Tennis Balls Bounce?
Why Do Tennis Balls Bounce? Like many other types of balls, tennis balls have a hollow center filled with air. Like all gases, the air inside a ball moves around easily...
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Why Does a Blimp Rise?
A blimp rise as because it is filled with a gas that is lighter than the air around it. A blimp rise also depends on the pressure of the gas inside to keep it inflated...
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Which Ink Is Used in Erasable Pens?
Erasable ink used in erasable ball-point pens is a gooey substance that looks like tar. Scientists from The Paper Mate Company invented it by combining ink with rubber....
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