Earth science
Salt water, layered oceans, clouds in a jar, and what we are doing to the planet.
17 lessons
Water and density
Layers that refuse to mix, dye that behaves strangely in salt, and what that means for the oceans.
Buy alone for $6
8 lessons
Air, weather and convection
Why warm air really rises, how a cloud forms in a bottle, and the lake that suffocated a valley.
Included in membership
8 lessons
Taking care of the planet
Is my car killing the ocean? Could aluminum cans replace gas? Experiments about the choices we make.
Included in membership