Sciencespeaking topic
Your breath probably contains a few molecules from Cleopatra's last breath. Over thousands of years air molecules have mixed across the whole world. Is the past, quite literally, circulating in our lungs?
— molecular diffusion / mixing
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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