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In this activity, learners make a model of a one-way heart valve to investigate how a heart controls the direction of blood flow.

Learners explore soybeans, soak them in water to remove their coat, and then split them open to look inside. They also make a musical shaker out of paper cups, a cardboard tube, and soybeans.

In this four-day activity, learners grow bacteria and/or fungi from a variety of locations and compare the results.

This experiment allows learners to experience a small scale "epidemic," demonstrating the ease with which disease organisms are spread, and enables learners to determine the originator of the "epidemi