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Most of the answers above suffer from two problems: possibility for infection, and that they're permanent. If you don't care about that, fine, but if you do, let me offer an alternative. Cochlear ...
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#1: Attribution notice removed
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System
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2020-07-20T17:03:17Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/87231 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/