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In this activity (on page 2 of the PDF under GPS: Sailboat Design Activity), learners will discover how the shape of an object, not just its weight, determines whether it floats or sinks.

In this activity, learners use tinfoil to build and test their own boats - which designs will float, and which will sink?

In this design challenge activity, learners use two helium-filled balloons to build a blimp that can travel in a straight path across the room.

Using simple, inexpensive items, learners build and test submarine models.