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

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.