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The need for surprise attacks. Most humans (and, in many cases, animals) don't think in three dimensions. All of the people we interact with are, in general, at the same elevation we're at, moving...
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#1: Attribution notice removed
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System
·
2020-06-01T14:13:46Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/22021 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/