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Trading Places: Redox Reactions
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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.
Currently Working: Testing Conductivity
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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.
Forwards and Backwards: pH and Indicators
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Visitors prepare six solutions combining vinegar and ammonia that range incrementally from acid (all vinegar) to base (all ammonia).
Make a Totem Pole
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In this activity (on page 2 of PDF), learners make their own totem poles out of recycled materials.
Build a Battery
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Learners make a simple battery out of "sandwiches" of aluminum foil, pennies, and a salt water-soaked paper towel.
In the Toilet
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This activity explores the basic workings of a siphon, which is the core technology that makes toilets work.
Yeast Balloons
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Visitors observe a bottle with a balloon attached around the mouth. The bottle contains a solution of yeast, sugar, and water.
Pot-in-Pot Refrigeration
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In this activity (on page 2 of PDF), learners create a low-tech refrigerator that requires no electricity to keep food from spoiling.
Hanford at the Half-Life Radiation Calculator
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This quiz lets you estimate your annual radiation exposure.
The Best Dam Simulation Ever
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This online simulation game explores the different consequences of water levels on the Columbia River in the Pacific Northwest.
Designing Bandages
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Learners design different shaped bandages for different purposes. First, they draw their designs on paper.
A Hole in the Ground
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Learners build models of sinkholes to gain an intuitive knowledge of their physical aspects.
Building a Community From the Ground Up
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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
Stethoscope
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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!
Quipus
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Learners create an Incan counting device called a quipu (pronounced kee-poo).
Slide Rules
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Learners make their own simple slide rules out of paper and learn how they work.
Secret Writing Devices
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In this activity about encryption, learners cut out a secret decoder badge from a handout and use it to encode messages to each other.
Gross Growth
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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.
Fingerprint Identification
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In this activity (on page 2) about fingerprint analysis, learners use graphite from a pencil and scotch tape to capture their fingerprints.
Hot and Cold: Endothermic and Exothermic Reactions
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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.