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Are Microbes Alive?

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In this activity (on pages 19-21 of the PDF) learners observe mold growing on potatoes. Preparation for this activity has to start a week before, to allow time for the mold to grow on the potatoes.
1 cent - $1 per group Ages 4 - 14 30 to 45 minutes

Perspectives: Powers of 10

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In this activity, learners complete a series of drawing activities to explore scale and powers of 10. Learners first trace each other on 1-meter-square pieces of paper.
1 cent - $1 per student Ages 14 - 18 30 to 45 minutes