I‘ve been researching the absolutely fascinating theory of how humans created time. It lead me on an amazing adventure from studying the increase of human skull width to lunar cycles. I feel I know how we created time-I now see robust evidence on why it started ~150,000 yrs ago.
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Thank you so much for sharing your train of thought, Brian - I appreciate! :) It's interesting that the facts from Wikipedia tell a less coherent story: Menstrual (instead of estrous) cycles are common to most primates, and humans reached anatomical modernity ~300k yrs ago.

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Florian, thank you! Indeed there is disagreement about the definition: "Overt menstruation where there is bleeding from the uterus through the vagina is found primarily in humans & close relatives such as chimpanzees". Still debate about close relatives. https://en.wikipedia.org/wiki/Menstruation_(mammal) …
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