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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.

Visitors add drops of copper sulfate solution onto a steel nail. They observe the nail change color from silver to brown as the copper plates onto the nail.

Visitors test solutions of water, sugar, salt, and hydrochloric acid and the solids salt and sugar. They clip leads from the hand generator to wires immersed in each substance.

In this arts and crafts activity about animals and animal characteristics, learners will design animal hats and role-play as animals.

Visitors prepare six solutions combining vinegar and ammonia that range incrementally from acid (all vinegar) to base (all ammonia).

In this activity, learners use their imaginations and experiment with different materials to create bug hats.

This activity (on page 2) explores how sensing is part of robotics. Learners try tying their shoes with different constraints.

Visitors observe a bottle with a balloon attached around the mouth. The bottle contains a solution of yeast, sugar, and water.

This quiz lets you estimate your annual radiation exposure.

In this classic memory game (on pages 37-45 of PDF), learners turn over tiles to reveal images on the back.

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

This online simulation game explores the different consequences of water levels on the Columbia River in the Pacific Northwest.

Learners design different shaped bandages for different purposes. First, they draw their designs on paper.

Learners compare the properties and solubilities of Styrofoam (TM), ecofoam packing peanuts, and popcorn. First, the solubility of each substance is tested in water.

In this activity, a group of learners work collaboratively to design and construct a paper model showing the evolution of an environment through multiple stages, from prehistory through the modern cit

Make a copy of the first stethoscope with only a cardboard tube! René Laennec invented the first stethoscope in 1819 using an actual paper tube!

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, learners grow germs collected from their hands and other objects. They cultivate the germs on a growth medium (such as slices of grapefruit or processed cheese) for a week.

In this activity (on page 2) about fingerprint analysis, learners use graphite from a pencil and scotch tape to capture their fingerprints.

Visitors mix urea with water in one flask and mix calcium chloride with water in another flask. They observe that the urea flask gets cold and the calcium chloride flask gets hot.