Historyspeaking topic
Why was Copernicus's On the Revolutions of the Heavenly Spheres, which defended a sun-centered model of the universe, so earth-shattering?
— Copernicus, De revolutionibus orbium coelestium
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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