Modern humanity is neither the "crown of creation" nor the result of long evolution. It generally arose, it seems, out of nowhere, suddenly and simultaneously. And before us on this earth lived many types of humanity. And not one of those whom we consider our ancestor was even our "relative." And these - other humanity - turned out to be much more successful than ourselves, and they lived ten times more than we exist today. It seems that different types of humanity arise and disappear on earth in a cyclical way - humanity "zeroes out," comes to its beginning, and everything starts again.