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Sign language is just radio communication but on another frequency

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wipasoda@lemmy.world
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showerthoughts@lemmy.world
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Because you use light to communicate in sign language, and light is just an electromagnetic wave like radio but on another frequency. You just need to be in line of sight

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Atrabiliousaurus@lemmy.world
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Yeah probably true. I only thought to look it up because I knew active and passive sonar was a thing.

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