General Knowledgespeaking topic
Why is the week seven days long? It matches neither the Moon nor the Sun and has no counterpart in nature; it is an entirely artificial invention from Babylonian astrology, based on the seven classical 'planets.' The most basic cycle organizing our lives comes not from the sky but from human imagination. Why did all of us fall in line with a rhythm that does not exist in nature?
— calendar history, the origin of the seven-day week
practice with this topic
Set the timer (5-30 min), take 20 seconds of prep if you like, start talking. Jot your thoughts onto the sticky-note board.
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