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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.

Learners use a commercially available toy to experiment with density. They fill a chamber in the toy submarine with baking powder and release it into a tank of water.

Learners mix a solution of luminol with hydrogen peroxide to produce a reaction that gives off blue light.

This quiz lets you estimate your annual radiation exposure.

Learners add two dyes to mineral oil and water, and then compare their miscibility (how well they mix) in each.

Using electrolysis, learners produce hydrogen gas and oxygen gas from water molecules in a solution.

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 make their own acid-base indicator from red cabbage. They use this indicator to test substances around the house.

In this activity (on page 2 of the PDF), learners (with adult help and supervision) investigate how heat affects polystyrene plastic.

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

During this activity, learners will make different versions of "ooze" using varied proportions of detergent and glue.

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

Learners observe a bottle containing water and oil. They are invited to pick up the bottle and mix the contents together.

Learners combine hydrogen peroxide with three different forms of potato: raw chunks, ground chunks, and boiled chunks.

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

Learners explore how recyclers take advantage of the different properties of materials, such as magnetism and density, to separate them from a mixture.

In this experiment, learners will conduct chemical and physical tests to identify mystery substances.

In this activity, learners discover that there is space between molecules even in a cup "full" of water. They first fill a cup with marbles, and then add sand to fill the gaps between the marbles.

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

In this activity (on page 2 of the PDF), learners make a plastic protein polymer from milk. Adding vinegar to milk causes the protein casein to solidify or curdle.