Sorry, my last was to yours of 22:22, mini.
Yes, absolutely about 'passive' eggs.
It is bizarre, isn't it?
mooncup - yes, what I describe is progress in scientific knowledge. I was responding to mini saying that by the time states and class systems had developed, we knew how babies were made. I am not sure things coincide so neatly, as I think we keep on learning more.
I am also trying to say that I think what we consider to be 'knowledge' (scientific or historical) is conditioned by our contemporary preconceptions (no pun intended). So, people thought they 'knew' how babies were made for centuries. But we keep making new discoveries that re-frame the old certainties.
It is quite likely more such discoveries will be made and we will again find that we have to reassess.
These discoveries don't all go in the same direction, though. People get the wrong ideas, or forget about a good idea for centuries (is it Lucretius who thought the world was composed of tiny particles or 'atoms'?). We live in a particular moment in time, and we naturally see everything from that point in time. So we arrange the past, conceptually, in terms of progress towards our current ideas. And that is a distortion. Inevitably.
This is why I want to get back to political ideology, rather than seeking root causes in prehistory. The political ideology that patriarchy is a system of oppression, is never going to change. People might give up on it as an ideology, but in itself, it isn't subject to change. Therefore it is qualitatively different from, say, the perception that women are born less intelligent than men, or the idea that the earth moves around the sun.