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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.

In this activity, learners confront their perceptions of gravity in the solar system.

This game is like regular bingo, except the clues are sounds.

In this activity (on pages 12-15), learners make a crater model and test the effects of weather (rain) on its surface.

Learners investigate a pre-constructed mystery tube to determine its interior mechanism.

In this chemistry meets cooking activity, learners compare the stability of egg white foams with various additives.

Learners mark their traits for tongue rolling, PTC tasting (a harmless, bitter chemical), and earlobe attachment on tree leaf cut-outs.

In this chemistry activity, learners explore whether matter is created or destroyed during a chemical reaction. They will compare the weight of various solutions before and after they are mixed.

In this creative activity, learners will practice looking carefully to observe details and to become familiar with dioramas as a method for displaying naturalistic scenes.

In this "game," learners explore and relate the evolution of stars to a Navajo creation story. The story is written on a series of cards, which are laid on a table as the story is told.

In this challenge, learners figure out how to make a juice stain disappear.

In this activity (page 4), learners work in groups to plan and build large structures using recyclable materials they have brought from home.

This activity includes several games about animal sounds. Using their sense of hearing and communicating with various kinds of noisemakers, learners role-play predator and prey.

In this activity, learners use geometry in observing the shapes and angles soap bubbles create when they join together.

In this activity, learners survey living organisms near where they live or go to school, and create a local field guide.

In this outdoor, winter activity, learners find living green plants under the snow and determine the light and temperature conditions around the plants.