Sciencespeaking topic
You heat water and heat it, and it only gets hotter; then with a single degree it suddenly becomes something else entirely, steam. Nature often doesn't change gradually, it resists for a long time and then leaps all at once. Why does real change come not as a gradual shift but as a sudden jump?
— phase transitions / critical 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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