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A common misconception is that, when confronted with the fact that regular ball point pens can't write in zero gravity, NASA spent millions of Dollars inventing and patenting a pen that could, whilst the Russians used a pencil. This is wrong as both Russian and American Space Agencies used pencils before adopting Fisher Pens.
Another is that NASA actively commissioned the production of these Fisher pens, but again that is wrong. Paul C. Fisher of Fisher Space Company Ltd designed and manufactured the first Fishers Pens before inviting NASA to try them out. They were and instant success and saw NASA and eventually Russia adopt these pens.
You can own one of your very own Fisher Pens as used by Astronauts on Apollo and Shuttle missons by purchasing from The Space Collective.

Fisher Space Pens