Sciencespeaking topic
Why was Galileo's telescopic discovery of Jupiter's four moons considered a blow to the Ptolemaic model of the universe?
— Galileo Galilei, 'Sidereus Nuncius' (1610) and the Galilean moons
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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