Posted on: Dec 19, 2011 at 05:10
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When NASA first planned to send up astronauts, they quickly
discovered that ball-point pens would not work in zero gravity.

To combat the problem, NASA scientists spent a decade and $1.2
billion to develop a pen that writes in zero gravity, upside down,
underwater, on almost any surface including glass and at temperatures
ranging from below freezing to +300 C.

Confronted with the same problem, the Canadians used a pencil. 

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