Sciencespeaking topic
In an epidemic there's a critical threshold: if each patient infects on average fewer than one other person the outbreak dies out, if more than one it explodes. The difference between the two is as thin as a hair. Why does the world behave as if either nothing happens or everything happens at once?
— R0 reproduction number / tipping point
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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