Jill Rubalcaba and Peter Robertshaw recount the unearthing of four hominins--Turkana Boy, Lapedo Child, Kennewick Man, and Iceman. Each discovery leads not only to deductions that scientists made in laboratories, but also to controversial debates over the scientists' differences of opinion over how, or even if, the pieces fit together.

Learn how specialized the field of archaeology has become and how new technology can change both scientists' theories and the way we view the past.