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Considering much of it is open to interpretation and debate there are many theories and it would be similar to arguing about which religion is more correct i suspect, we just don't know for sure so you have some info and i have other info obviously.
It's pretty similar with the pyramids, you're obviously agreeing with me in a way since you put forward the idea that they could have been built by time travellers, we just don't know and even though most ideas are unlikely, some can be more reasonable and a little less unlikely than others.
