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In this activity about water solubility and density, learners use critical thinking skills to determine why water can dissolve some things and not others.

$5 - $10 per student Ages 8 - 11 10 to 30 minutes
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This is an activity (on page 2 of the PDF under Bone Regrowth Activity) about the two main components of bone - collagen and minerals (like calcium) - and how they each contribute to its flexibility a

$5 - $10 per group Ages 8 - 14 1 to 7 days