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In this activity, learners explore and compare the buoyant properties of materials found in nature and in human-made materials.

Learners design, build, and test models of "dragon boats" made from up to three milk cartons.

Learners discover that soap can be used to power a boat. Learners make a simple, flat boat model, put it in water, and then add a drop of detergent at the back of the boat.

In this activity, learners build water-propelled engines from soft drink cans.

In this nanoscience activity, learners discover that it's easy to pour water out of a regular-sized cup, but not out of a miniature cup.