Fourth graders work together to complete an experiment on air pollution. They identify visible and invisible forms of pollution. They gather their data in notebooks and analyze their results to end the lesson.

Students witness various stages of mitosis through preparing onion root tip slides. With teacher guidance, they learn a great deal through the hands-on process of preparing the slides themselves.

In this video segment from Cyberchase, Inez estimates whether she has enough jelly beans in her large container to decorate all of the cookies in her batch.