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Our Space Store stocks an amazing range of Fisher Space Pens, including the AG-7 Space Pen and the Astronaut Space Pen, all of which can write upside down, underwater and in a vacuum! Because sometimes we need to do that... we don't. We don't need to do that, but it's nice to have the choice! These pens were developed by Fisher, and after much trial and error they eventually perfected a pen which used thixotropic ink (a semisolid). The cartridge within the space pen was pressurised with nitrogen so that it didn't rely on gravity to make it work. It was dependable in freezing cold and desert heat. It could also write underwater and upside down. The trick was to have the ink flow when you wanted it to, and not to flow the rest of the time, a problem Fisher expertly solved. Fisher's development couldn't have come at a more opportune time. The space race was on, and the astronauts involved in the Mercury and Gemini missions had been using pencils to take notes in space since standard ball points did not work in zero gravity. The Fisher cartridge did work in the weightlessness of outer space and the astronauts, beginning with the October, 1968 Apollo 7 mission, began using the Fisher AG-7 Space Pen and cartridge developed in 1966.