Time 4 Learning Time 4 Learning When NASA first started sending up astronauts, they quickly discovered that ballpoint pens would not work in zero gravity. To combat the problem, NASA scientists spent a decade and $12 billion to develop a pen that writes in zero gravity, upside down, underwater, on almost any surface, and at temperatures ranging from below freezing to 300 degrees Celsius. The Russians used a pencil
Posted on: Sat, 03 Aug 2013 13:14:21 +0000
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