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In this activity, learners calculate the percentage of oxygen in the atmosphere by using steel wool's ability to rust.

In this activity, learners create a model using metric measuring tapes and atmosphere composition data.

In this physics demonstration, learners will be surprised when a lemon slice appears to magically levitate within a pint glass.

In this Spanish-language chemistry activity, learners use simple materials to explore how fire extinguishers work to put out fires.