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Art by Francois Dubeau
“When I was a student at Cambridge I remember an anthropology professor holding up a picture of a bone with 28 incisions carved in it. ‘This is often considered to be man’s first attempt at a calendar’ she explained. She paused as we dutifully wrote this down. ‘My question to you is this – what man needs to mark 28 days? I would suggest to you that this is woman’s first attempt at a calendar.’ It was a moment that changed my life. In that second I stopped to question almost everything I had been taught about the past. How often had I overlooked women’s contributions?” ― Sandi Toksvig
Because the longest stable window of time a prehistoric person would be a lunar cycle, which happens to be 28 days.