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Trash Traits
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In this activity on page 24, learners perform experiments to examine whether or not trash can float, blow around, or wash away.
The Great Plankton Race
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In this activity, learners are challenged to design a planktonic organism that will neither float like a cork nor sink like a stone.
Weighty Questions
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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.
Make a Wire Critter That Can Walk on Water
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In this activity, learners make water-walking critters using thin wire, and then test how many paper clips these critters can carry without sinking.