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In this astrobiology activity (on page 11 of the PDF), learners consider what organisms need in order to live (water, nutrients, and energy).

In this activity, learners make water-walking critters using thin wire, and then test how many paper clips these critters can carry without sinking.

In this activity, learners observe fly behavior and then build a flytrap.

In this activity, learners construct bug models that "jitter" all over the table with just a battery, motor, and counterweight.