7 ms·
Did Advanced Civilizations Exist Before Humans? Silurian Hypothesis [video]
- bediger4000 4y agoI think at least one advanced civilization before ours existed. Turning to the original paper (1804.03748 on arxiv.org), there's many geologic signatures that aren't fully explained and match our own civilization's geo signature. There's just too many such geologic events for them all to be igneous or whatever.