On the artificial island grew up opium poppy] seven thousand years ag

In the middle of the XIX century the water level in the Swiss lakes sharply went down thanks to what one of the most important opening concerning the European Neolithic era was absolutely incidentally made — pile settlements. The Swiss archeologist Keller Ferdinand then assumed that people of the Neolithic era built houses on piles for protection against enemies or wild animals. Later pile dwellings of that period found in many places Europe, and also in Russian Federation, but their main part — in the Alps. Scientists have no consensus about that, from where in general this came technology. There were assumptions that pile houses — the local invention...