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In this activity about humans and space travel (page 1 of PDF), learners compare and contrast the behavior of a water-filled plastic bag, both outside and inside of a container of water.

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

In this activity on page 24, learners perform experiments to examine whether or not trash can float, blow around, or wash away.

The goal of this activity is to design the fastest sailboat or one that carries the most treasure.