This sharing of symbolic material culture and technology also tells us more about Homo sapiens' journey from Africa to Arabia and Europe. Contact between cultures has been vital to the survival and development of our common ancestors. The more contact the groups had, the stronger their technology and culture became.The more contact the groups had, the stronger their technology and culture became.
"Contact across groups, and population dynamics, makes it possible to adopt and adapt new technologies and culture and is what describes Homo sapiens. What we are seeing is the same pattern that shaped the people in Europe who created cave art many years later," Henshilwood says.
Jared Diamond spent a lot of time wandering around New Guinea with local guides, and in The World Until Yesterday has a wonderful account of how new Guineans interacted with people from other areas. One regular topic of conversation was plants – what do you call this vine? what is it good for? can you eat these berries? how do you prepare that medicine? It shows perfectly how cultural exchange happens, and how fundamental it is to human nature.