Sciencespeaking topic
The more mass there is in a place, the more slowly time flows there. Your feet age a little more slowly than your head, because they're closer to the ground. Does height really change our age?
— general relativity / gravitational time dilation
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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