looking at this it seems quite obvious that we blew ourselves back to square one multiple times https://t.co/uCBWAsRler

The “Silurian Hypothesis” is a fun thought experiment.

It posits Earth may have had advanced civilizations in the deep past that we are, today, unaware of. Why wouldn’t we know about them? Because if they existed millions of years ago and died out, their architecture would be long gone. “No ruins of ancient football stadiums, highways or housing pro... See more