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Often there is a simpler solution

pencilWhen NASA started sending astronauts into space, they quickly discovered that ballpoint pens would not work at zero gravity.   To combat the problem, NASA scientists spent a decade and $12 billion developing a pen that wrote at zero gravity, upside down, underwater, on almost any surface including glass and at temperatures ranging from below freezing to 300C.

The Russians used a pencil.   BOOM!!!

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