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Soap: Sometimes oil and water do mix!
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In this activity (on page 2 of PDF), learners mix oil and water. Then, they add soap and observe what changes! The activity demonstrates how oil and water don't mix, except when soap is added.
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.
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.
Wingin' It
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Learners explore the Bernoulli effect by building an airfoil (airplane wing) and making it fly.