The prehistory of Global Colonisation.  Human evolution is persistently seen as a movement from inferior to superior, primitive to advanced, simple to complex. Timewalkers extricates prehistory from the myths and distortions created by this view of the past. By focusing on changes in behavior and stressing the deliberate human purpose our ancestors displayed in their migrations, Gamble produces an intriguing synthesis of  three million years of archaeology,  a detailed study of global colonisation rather than a conventional reassessment of fossil remains and stone tools. Gamble reconsiders the remarkable record of geographical expansion that began with the early hominids of sub-Saharan Africa who spread to new continents, to the marginal environments of desert and taiga, and to islands in the oceans and the Mediterranean. Through this dispersal of humans he traces calculated responses to variations in climate and environment. As he interprets these migrations in terms of behavioral change in a social and ecological context, he offers a critique of the attitudes of early European explorers, on which so much of nineteenth- and twentieth-century archaeology unquestioningly rested.