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In this sunny day activity, learners compare how a cup of water and a cup of tonic water reflect or refract light in the sun.

Learners build particulate matter collectors--devices that collect samples of visible particulates present in polluted air.

In this outdoor activity, learners discover how the environment around a building affects the growth of plants.

In this activity, young learners (2 years and up) explore tree structure and biology. Tree products are explored by painitng with fruit.

This activity (on pages 10-12 of the PDF) encourages learners to consider what makes living things different from non-living things.

In this outdoor activity, learners discover that plants aren't just shoots (stem, branches, leaves, and flowers) growing above ground, but contain plenty of roots growing underground—more than half th

In this activity, young learners (2 years and up) explore dirt and what is in it by painting with mud.

In this activity, learners will construct a measuring device (snake "string") to improve their observation skills.

In this outdoor activity/field trip, learners explore the concept of population density.

In this outdoor/indoor activity, learners collect ants and dirt to create an ant farm in a cup that they can observe over time.

In this activity, learners will engineer their own weather vane. This activity includes step-by-step instructions with pictures and a "What's Happening?" section explaining how the activity worked.

In this outdoor activity, learners build bird nests and place them in the activity area, then play the role of naturalists as they try to locate each other's nests.

In this activity, learners will explore engineering to construct an insect collecting tool (insect aspirator). The pooter uses suction to safely collect smaller insects that nets miss or may injure.

In this outdoor science/art activity, learners investigate spider webs by using string to create their own spider webs.

In this activity, learners use the Sun's energy to cook marshmallows. Learners construct the solar oven out of simple everyday materials.

Learners build a simple solar oven from a shoebox, black construction paper, and aluminum foil. Over the course of a few hours, the oven heats up water enough to brew tea.

In this activity, learners observe fly behavior and then build a flytrap.

In this health and fitness activity, learners focus on the importance of daily physical activity, specifically walking.

In this activity, learners will trick out their bike with crafts and flair. Learners will explore symmetry, cause and effect and design through this activity.

In this activity (on page 2 of PDF), learners create a low-tech refrigerator that requires no electricity to keep food from spoiling.