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When NASA first started sending up astronauts, they quickly discovered that ballpoint pens would not work in 0 gravity. To combat this problem, NASA scientists spent a decade and $12 billion developing a pen that writes in zero gravity, upside down, underwater, on almost any surface including glass and at temperatures ranging from below freezing to over 300 C.

The Russians used a pencil.
 
Mott the Hoople said:
When NASA first started sending up astronauts, they quickly discovered that ballpoint pens would not work in 0 gravity. To combat this problem, NASA scientists spent a decade and $12 billion developing a pen that writes in zero gravity, upside down, underwater, on almost any surface including glass and at temperatures ranging from below freezing to over 300 C.

The Russians used a pencil.
Click to expand...

Actually that is an urban myth, the last thing you want in a spacecraft is a piece of graphite causing a short circuit in weightless conditions.

http://www.snopes.com/business/genius/spacepen.asp
 
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