Flooding and continual resets. If this was practiced every few hundred years, I can see why we are so disconnected and live shorter lives. Clearly one reset would not be enough to keep us down. Constant resets makes it much easier to control us and knowledge, remember knowledge is power. The organizations like the Vatican and Smithsonian to name a couple that are hiding our past has done such a job on it that, even they have lost much knowledge themselves.