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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 design challenge, learners use their creativity and imagination to design and test a wildlife crossing for their favorite animal.

In this activity, "write" a secret message in genetic code as beads on a string.

The goal of this activity is to design, build and test a house or toy for an animal.

This activity has three story puzzles learners can solve to learn about life in the Arctic.

Learners will build a lung model to understand how their lungs and diaphragm work to make them breathe.

In this invention challenge activity, learners create an indoor game for one or two people that gets you moving.

In this invention challenge activity, learners see how many objects they can grab with a homemade "bionic" arm.

In this activity, learners explore the possibilities of clay as a natural material.

In this environmental activity (page 6 of the PDF), learners identify household products that are recyclable and explore the different types of recyclable plastics.

In this activity, learners make homemade journals featuring seashell rubbings. First, learners transfer the texture of a seashell onto a piece of paper using a crayon.

In this engineering activity (page 3 of PDF), young learners investigate how a pole can be made stable by “planting” its base in the ground or adding supports to the base.

In this activity, learners explore chemiluminescence and fluorescence. Learners examine 3 different solutions in regular light, in the dark with added bleach solution, and under a black light.

Learners make their own paper. They start by shredding old newspaper, clean toilet paper, and clean paper towels.

In this activity (15th activity on the page) about the sense of touch, learners use glue and cardboard to construct a maze they use with their eyes closed.

In this activity, learners will explore two-dimensional shapes that are found in three-dimensional shapes. Learners will explore geometry, design, color and tool use through this activity.

Learners design their own experiment to investigate how pollution diffuses through ground material.

In this activity, learners examine ways that Native Americans of the Southwest express their relationship with nature through art.

In this activity, learners build one or more edible coral polyps and place them together to form a colony.

Learners design different shaped bandages for different purposes. First, they draw their designs on paper.