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> the speed of light is very close to the speed of sound in a perfect vacuum

I am not knowledgeable in physics but this looked wrong to me until I reflected that in a near vacuum, the elasticity is very high and density nearer to zero. So per the equation of speed of sound, (square of ( elasticity / density ) ) is extremely high, so near the speed of light.

Not so bad.

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The reply to the prompt is almost complete non-sense. In particular the statements about the speed of sound in vacuum. However in some instances (synthetic quantum systems) you can treat the speed of sound in an ultra-cold gas as the „light-speed“ in a curved space-time. This was recently experimentally demonstrated.

I think in the future humans will need to invent secret languages, not digitized or shared with computers in order to be able to filter wrong but convincing information.

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