Our idea now is that human being today is superior to the human beings from our past. Some scientist claim that simply is not true. They are explaining it through fact that cycles go through periods of increase and periods of decrease.
As a conspiracy theorist, there have been ETs more superior and humans are allegedly engineer species to serve them just like Illuminati cults serve the Vril Reptilian.
Yes, I have heard about it too. But I also think our ancestors knew the nature much better than us. They were more aware.