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Learners smell balloons filled with different scents to guess what's inside. From this, they infer the presence and motion of scented molecules.

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

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

Learners explore water adhesion and learn about why water molecules are more strongly attracted to some substances than others.