Paperback edition of this highly accessible explanation of evolution. Following its hardback success, Phoenix's superlead title offers a contemporary account of how evolution took place. The river in the title is a river of DNA, flowing from the beginning of life on earth on towards the future. Dawkins goes on to investigate features that other living information systems might have with details on detecting their existence elsewhere in the universe. "Beautifully written and painless to read, there is barely a paragraph that could have been made easier to understand." "Sunday Times".