The history of Western civilization, from prehistoric times until relatively recently (so recently, in fact, that one cannot be absolutely certain the pattern has been broken), has been marked by successive waves of invasions by wild barbarians from the north. (This explains why DrRich will never completely trust the Canadians.) Every few hundred years, one group of primitives or another – Scythians, Goths, Vandals, Huns, Avars, Norsemen, Bulgars, Mongols, and others named and unnamed – would sweep down upon their betters, upon the more civilized, more culturally and intellectually advanced people to the south, and by the expediencies of slaughter, rape and pillage, would take their land, possessions, freedom, and their lives. The advancing barbarian wave would eventually play itself out, and individual members of the untamed horde would simply settle in place, and over a few generations would become civilized themselves – until the next group of barbarians, in turn, would fall upon them.
It was a cycle as natural as the seasons.
What drove these irresistible barbarian movements? Historians still argue about it. Likely these violent migrations were caused by several different things – famine, plague, encroachment by even nastier barbarians from even farther north, and climate change (though this latter conjecture is now politically incorrect, since the official and proper view of the earth’s climate is that it was absolutely stable for millions of years, until Henry Ford and George Bush came along and bent the temperature curve upwards, like a hockey stick).
The reason DrRich brings all this up, of course, is: to warn his medical colleagues about the cardiologists.