The Zero Gravity Pen is a revolutionary writing instrument that uses pressurized ink cartridges and can write in zero gravity, underwater, or on greasy paper. Unlike most ballpoint pens does not rely on gravity to get the ink flowing- instead, it has an ordinary cartridge filled with nitrogen at 35 pounds per square inch. This pressure pushes the ink toward the tungsten carbide ball at the pen’s tip. The ink, too, differs from that of other pens.

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