> 3) ... We're not talking about time scales of a few centuries though. We're talking about hypothetical civilizations potentially dating back to the evolution

> 3) ... We're not talking about time scales of a few centuries though. We're talking about hypothetical civilizations potentially dating back to the evolution of modern homo sapiens, which is now believed to at least be over 300,000 years ago[1]. I honestly don't see how this could plausibly be falsified, since an absence of evidence is not evidence of absence and an awful lot of entropy can happen in a hundred thousand years or more. I'm content to idly muse about it though. [1] https://www.britannica.com/story/just-how-old-is-homo-sapiens https://www.britannica.com/story/just-how-old-is-homo-sapien...