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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 activity on page 15 of the PDF, discover how materials and physical forces behave differently at the nanoscale.

Visitors prepare six solutions combining vinegar and ammonia that range incrementally from acid (all vinegar) to base (all ammonia).

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.

This three-part activity consists of an activity that groups of learners develop themselves, a given procedure, and an optional demonstration.