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In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database.

Learners explore their surroundings while reasoning about categories and counting.

In this activity, learners will create an optical illusion top. Learners will explore color mixing, physics and design through this activity.

In this activity on page 13 of the PDF, use a special plastic card that has been painted with a chemical that changes color when it is in UV light.

In this activity about bones (page 12 of PDF), learners investigate and compare the weight-bearing capacity of solid and hollow cylinders.

In this activity about the solar system, learners use various light sources to examine ice with different components to understand how NASA studies planets and moons from space.

In this activity (posted on March 27, 2011), learners follow the steps to construct a mini zoetrope, a device that produces an illusion of action from a rapid succession of static pictures.