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

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

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

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

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.

Learners observe a flask with a balloon attached over the mouth and inverted inside the flask.

In this activity (on page 2 of the PDF), learners explore surface tension by adding pennies to cups which are "full" of plain water or soapy water.

Learners will explore the scientific mystery behind a disappearing group of trees by examining data and attempting to explain the decline.