Sciencespeaking topic
It takes tens of thousands of years for light to travel from the Sun's core to its surface, but only eight minutes to reach your eye from there. The light you see may have been born when mammoths still walked. How old can a single 'moment' really be?
— photon diffusion / the Sun
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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