Was life triggered by some event, like lightning hitting a pond full of amino acids? Earth was teeming with life billions of years before the dinosaurs existed. Single-celled organisms inundated the oceans, and the soil swarmed with living creatures. Where did it all come from and how do you go from a single-celled organism to a trillion-celled organism like Man? Cutting-edge science is testing out answers about life's origins and how life can be created on new worlds--or even our own.