| 转贴：Your tax dollar is at working |
| 送交者: 求真知 2016年11月13日23:24:51 于 [笑林之声] 发送悄悄话 |
Ball point pens When NASA started sending astronauts into space they quickly discovered that ball-point pens would not work in zero gravity.
To combat this problem, Congress approved a program and NASA scientists spent a decade and over $165 million developing a pen that writes in zero gravity, upside down, on almost any surface and at temperatures ranging from below freezing to over 300 C.
The Russians used a pencil...
Your taxes are due again in April
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