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How high in the sky are you safe?

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I understand that there is wide range of bullet calibers. I am interested in the ones that is 50 caliber or less, and if you can be high enough in a blimp to be safe either by to far to see or to far to reach?

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Could a city be built out of Balloons?

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This post was sourced from https://worldbuilding.stackexchange.com/q/109262. It is licensed under CC BY-SA 3.0.

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