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In this geology activity, learners create a model using a mixture of salt and sand inside a CD case. When the case is tilted or inverted, the mixture dramatically sorts into a layered pattern.

In this activity about water's cohesive and adhesive properties and why water molecules are attracted to each other, learners test if objects repel or absorb water.

In this activity, learners collect, categorize, weigh and analyze classroom trash and discuss ways that engineers have helped to reduce solid waste.

In this activity (located at the top of the page), learners make an easy river strainer and see what they can catch.

In this activity, learners simulate the separation techniques that materials recovery facilities (MRFs) use and then design their own series of recycling techniques.

In this activity, learners separate materials based on their special properties to mimic the way recyclables are sorted at recycling centers.

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