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Apres les chocs climatiques repetes qui, en liberant les mains, ont declenche l'evolution biologique et culturelle des Hominides, tout depend des cerveaux des especes concernees et de leurs capacites de correlations et d'invention sous la pression permanente du milieu naturel et social. Il importe moins ici d'y decrire 15 << pas >> que de preciser, a chaque repere d'un processus continu,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.