Sciencespeaking topic
Diamond and the tip of a pencil are made of exactly the same atom, carbon. One is the hardest substance on Earth, the other rubs off with a finger. How do the same bricks build two such different worlds?
— crystal structure / allotropes
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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