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In this classic hands-on activity, learners estimate the length of a molecule by floating a fatty acid (oleic acid) on water.

Electrolysis is the breakdown of water into hydrogen and oxygen. This Exploratorium activity allows learners to visualize the process with an acid-based indicator.

In this activity, learners explore liquid crystals, light and temperature. Using a postcard made of temperature-sensitive liquid crystal material, learners monitor temperature changes.

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