It's stunning to think that we know enough biology to make a good guess at the entire billion-year history of life itself, possibly the history of all life in t

It's stunning to think that we know enough biology to make a good guess at the entire billion-year history of life itself, possibly the history of all life in the universe. In one sense, producing this tree is a major goal of biology, a battle fought by Linneus, Mendel, Darwin, and thousands of biologists in the centuries between.