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Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.

Create 3D glasses and use them to explore color, light and optics. Fool your brain into 'seeing' three dimensions on a flat surface!

In this activity, learners simulate nature's water filtration system by devising a system that will filter out both visible and invisible pollutants from water.

In this activity, learners explore how engineering has developed various means to remove impurities from water.

How many colors make black? Gather as many water soluble black markers as you can find.

Learners analyze mixtures of dyes using filter paper chromatography. They place spots of the different dyes at the bottom of a piece of filter paper, and hang the paper to touch the surface of water.

In this activity, learners interact with whale artifacts such as replicas of skulls, bones, teeth, and baleen (hair-like plates that form a feeding filter).

In this activity, learners use gelatin as a lens to investigate the properties of laser light.

Water treatment on a large scale enables the supply of clean drinking water to communities.