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Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.

In this activity, learners conduct a simulation exercise related to public key encryption and try to intercept a message sent between two learners.

In this activity, learners build an electric two-paddle boat using paint paddles, plastic knives, and empty water bottles.

In this sports-themed engineering activity, learners create super bouncy balls out of balloons. Learners brainstorm, test their designs, and share results.

In this invention challenge activity, learners create an indoor game for one or two people that gets you moving.

In this activity, learners explore the possibilities of clay as a natural material.

In this activity, learners build small animated toys that move.

In this engineering activity (page 3 of PDF), young learners investigate how a pole can be made stable by “planting” its base in the ground or adding supports to the base.

In this activity, learners build a seesaw powered by magnets.

Learners design their own experiment to investigate how pollution diffuses through ground material.

In this activity, learners build one or more edible coral polyps and place them together to form a colony.

In this activity, learners will first learn the basics of galaxy classification and grouping.

In this activity, learners use a model for how fishing affects marine life populations, and will construct explanations for one of the reasons why fish populations are declining.

In this activity, learners design a therapeutic agent to image and/or cure various diseases in the respiratory system.

This game uses a modified Uno deck to review concepts related to stem cell research and diabetes.

In this activity, learners take on the role of a carbon atom and record which reservoirs in the carbon cycle they visit.

In this activity (page 2 of PDF under GPS: Alligator Habitat Activity), learners will study the adaptations different fish species have developed to survive in their habitats.

In this activity, learners make a black box device that serves as an excellent analogy to Rutherford's famous experiment in which he deduced the existence of the atomic nucleus.

In this activity, learners build a stuffed-animal zip line. Learners hold a cord against a wall, hook a cute stuffed animal onto it, let the animal slide down, and records its travel time.

By tossing, collecting, and sorting beanbags, learners understand how the IBEX spacecraft uses its sensors to detect and map the locations of particle types in the interstellar boundary.