> The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old. And yet ci

> The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old. And yet civilisation has only existed (that we know) for the last few thousand years. It seems that it might take a long time for complex life to establish itself. Brian Cox touches on this here https://youtu.be/aPOCP4GHJvI https://youtu.be/aPOCP4GHJvI at around the 7:00 mark.