Andrew H. The play-player bought the first three billion years of life (Opavinia 1) and a book. The book Life First Three Billion Years > has come to have time to explore the evolution of life and the field of the angels in the planet. And I've learned 500 million years ago that the era of the great open-ended biological possibilities is called the Cambrian explosion. Most of the life that we know came about then, and then we've got to freeze the path of evolution through the gates and continue