[ 分类: 开心一刻 ]
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 d ...
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jtong007 @ 01/27/2010 12:42 am
[ 分类: 开心一刻 ]
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 d ...
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