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In this activity, learners add food coloring to hot and cold water in order to see how fluids at different temperatures move around in convection currents.

$1 - $5 per group Ages 8 - adult 5 to 10 minutes
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In this activity, learners explore how distance can affect the way we perceive the size of an object.

free Ages 4 - 18 5 to 10 minutes