The 4 billion year old story of evolution on this planet - from the slow emergence of the first organisms out of the primordial soup to the present rapid evolution of technology and beyond.
From the author:
"I cannot believe that we are at the end of this story - we are not evolution's ultimate product. There's something coming after us, and I imagine it is something wonderful. But we may never be able to comprehend it, any more than a caterpillar can comprehend turning into a butterfly."