We evolved as a species in the savanna lands of Africa, but then you see humans migrating into new environments, into desert lands, into jungles, into the Ice Age tundra of Siberia -- tough, tough environment -- into the Americas, into Australasia.
Vi har udviklet os som art i savannelandskabet i Afrika, men så ser man mennesker der migrerer til nye miljøer, ind i ørken landskaber, ind i jungler, ind i den siberiske tundra i istiden -- barske, barske miljøer -- ind i Amerika, ind i Australasien. Hver migrering involverer læring --