Could evolution have done it any other way? Did it have to bring forth humans as the crown of creation? Or would dinosaurs be ruling the world today if an asteroid hadn't struck Earth 66 million years ago? Evolutionary biologist Jonathan Losos achieved something in his research on lizards that Darwin never even dared to dream of: observing evolution at work and proving that it repeats itself. On a fascinating journey around the globe, the gifted storyteller Losos teaches us that evolution does not roll dice—and yet humanity owes its existence to chance.