Sciencespeaking topic
The falling of leaves in autumn isn't death but a deliberate 'investment decision' by the tree; since feeding the leaves in winter would be a loss, the tree sacrifices them. Is losing sometimes the most profitable move?
— plant physiology / leaf abscission
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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