How Are Baseballs Made?
How Are Baseballs Made? Official baseballs begin with cork centers, which are covered with a bouncy rubber cover. Machines build the balls to the correct, specified...
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How Does an Eraser Work?
What does eraser mean? A device, as a piece of rubber or cloth, for erasing marks made with pen, pencil, chalk, etc. How does an eraser work? When you rub an eraser...
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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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