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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.

Learners make a simple battery out of "sandwiches" of aluminum foil, pennies, and a salt water-soaked paper towel.

This activity explores the basic workings of a siphon, which is the core technology that makes toilets work.

Learners make a refrigerator that works without electricity. The pot-in-pot refrigerator works by evaporation: a layer of sand is placed between two terra cotta pots and thoroughly soaked with water.

Learners explore the Bernoulli effect by building an airfoil (airplane wing) and making it fly.

This is a series of demonstrations about different electrical and magnetic phenomena.

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

Learners work in groups to construct bridges using stale marshmallows and toothpicks.

Learners design, build, and test models of "dragon boats" made from up to three milk cartons.

In this activity, learners explore color, light and shadow by creating their own puppets to hold in front of a light source.

In this activity, early learners combine pre-cut recognizable shapes and their own abstract ideas to make representational pictures (e.g. houses, trees, shoes).

This is an activity in which learners explore the effects of gravity, motion and momentum while creating art.