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In this activity, learners use a flashlight, a glass of water, and some milk to examine why the sky is blue and sunsets are red.

In this activity, learners sublimate dry ice and then taste the carbon dioxide gas.

In this activity, learners investigate the properties of graphene and graphite.

Learners measure a bottle full of air, and then use a vacuum pump to remove the air. When they re-weigh the bottle, learners find the mass is about 0.8g less.

Learners experiment with a commercially available liquid-crystal coaster. They warm the material with their hands for varying lengths of time and observe the changing colors that result.

This is an online game about stopping distance. Learners choose one of three vehicles and one of three speeds.

This is a highly visual demonstration that illustrates both the effects of density and chemical reactions.