枪支：火器的演变史 Guns: The Evolution of Firearms (2013)认领

　　The great gift of man over beasts has been his ability to craft and use tools. A simple stone axe gave man the power to shape the world around him. A spear -- the difference between a family living or dying... But the axe and the spear could also become weapons, as individuals, tribes, and eventually nations struggled against each other in their fierce determination to survive....