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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
chalk art and the brain
Fun. For more by this artist, Julian Beever, see here. Which of the different ways a Beever drawing looks when seen from different perspectives is the "real" one? Along similar lines, which of the sounds different people (or animals) hear a tree make does it make if there isn't anyone around to hear it?