An exploration of the history of life and the importance of humanity as an evolutionary force. It explores reasons for the extinction of the sabre-toothed tiger... » 

An exploration of the history of life and the importance of humanity as an evolutionary force. It explores reasons for the extinction of the sabre-toothed tigers, sloths, camels, hippos, mastodons and mammoths, and provides a tour of mass extinctions throughout earth's history. «