The US Government has rigorous specs for the pens it buys….

The US Government has rigorous specs for the pens it buys. Assembled by blind people, the pens must be able to write for a mile and in temps 160F to -40, are designed to fit undetected into uniforms, can stand in for a two inch fuse, and be used for an emergency tracheotomy. source

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Source: Weird Facts
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