The archaeologist's finds do not tell by themselves how the men of some particular period actually lived. To reconstruct that way of life (the whole 'culture') needs comparative study of many different primitive tribes still surviving in out-of-the-way places of this world. Then it gradually becomes clear how a given set of tools was made and used, how the people who made them in the remote past must have lived. Something can even be said of the social organisation -when social organisation came into being- but with less certainty. The very fact that a primitive tribe in Australia or the interior of Brazil can be studied means that the tribesmen have had some contact with the outside world and eventually with civilisation.