This book chronicles major turning points in human evolution, from the introduction of primates to Homo Sapiens. The facts accumulated in recent years in anthropology, molecular biology, archeology and a number of other sciences force us to reconsider many traditional ideas about the progress of this process. Its nodal events in the light of new data are not seen in the same way as ten or even five years ago, but where are the old questions? quando? how could I? and why? require new answers.