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This Exploratorium activity explores size and scale. Through four levels of screen sizes, learners can sort out objects of different sizes.

In this math lesson, learners identify the likelihood of an event by using a walk-on probability scale.

In this activity, learners will create a diagram of the ocean zones and determine what organisms live in each zone.

In this activity, learners make a model of a beehive using simple materials.

Build and test a scale model of a rainforest canopy walkway.

In this activity (on pages 16-21), learners get a sense of geological time by understanding how big a million is.

Learners use red cabbage juice and pH indicator paper to test the acidity and basicity of household materials. The activity links this concept of acids and bases to acid rain and other pollutants.

In this activity, learners create and reveal secret messages written with invisible ink! The invisible ink is actually a baking soda solution, and the magical revealing liquid is fruit juice.

In this experiment, learners design and build a model room in a shoebox and furnish it with tiny furniture.

Working in groups, learners model the continuous destruction and creation of ozone (O3) molecules, which occur in the ozone layer.