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In this activity (page 32 of PDF), learners investigate the nutritional needs of healthy bones and muscles.

free Ages 6 - 11 45 to 60 minutes
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Learners grow sugar crystals (rock candy). They make a hot solution that has an excess of sugar dissolved in it, then as the solution cools, they see sugar crystals form.

$1 - $5 per student Ages 6 - 11 4 to 24 hours