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In this activity about osmosis, learners use a naked egg (one with a dissolved eggshell) to learn about selectively permeable membranes.

1 cent - $1 per student Ages 11 - 18 10 to 30 minutes
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In this experiment, learners float colored ice cubes in hot and cold water.

1 cent - $1 per group Ages 11 - 18 45 to 60 minutes