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This lesson (on pages 46-55 of PDF) features two strategy board games -- one from Ghana and one from China. The first game, Achi, is a cross between checkers and tic-tac-toe.

1 cent - $1 per student Ages 8 - 14 45 to 60 minutes
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In this activity, learners will make seed orbs to grow new trees and plants. Learners will explore ecology and life cycles as well as stewardship through this activity.

$1 - $5 per student Ages 4 - 14 10 to 30 minutes
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In this activity, learners help identify native and non-native plant species, learn about invasive species, and determine how native plants provide a healthier habitat.

$10 - $20 per group Ages 8 - 18 30 to 45 minutes
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In this activity, learners explore the possibilities of clay as a natural material.

$5 - $10 per group Ages 4 - 11 30 to 45 minutes
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In this activity (on pages 25-32 of PDF), learners make models of the inner ear out of pipe cleaners.

1 cent - $1 per student Ages 8 - 18 10 to 30 minutes
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The popular sudoku puzzles use numbers, but the game could played with any set of 9 different objects!

1 cent - $1 per student Ages 8 - 14 45 to 60 minutes
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In this optics activity, learners examine how a transparent material such as glass or water can actually reflect light better than any mirror.

1 cent - $1 per group Ages 8 - 18 10 to 30 minutes
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In this activity, learners construct a device that allows them to view 2-D images in 3-D.

Over $20 per student Ages 6 - 11 1 to 2 hours
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Learners make their own paper using old newspaper. Learners can make their paper colorful by adding construction paper.

1 cent - $1 per group Ages 4 - 11 1 to 2 hours
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Learners make a simple battery out of "sandwiches" of aluminum foil, pennies, and a salt water-soaked paper towel.

$1 - $5 per group Ages 8 - 14 5 to 10 minutes
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Play-Doh is conductive! Use the semiconductive qualities of Play-Doh to make your own squeezable instrument. Pico Cricket is required.

Over $20 per group Ages 6 - adult 45 to 60 minutes
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Learners use a simple process to extract DNA from strawberries.

$1 - $5 per group Ages 8 - 14 10 to 30 minutes
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Learners observe a sealed container holding a clear colorless liquid. They shake the container and the fluid turns blue. When allowed to sit for a few moments, the fluid turns colorless again.

$1 - $5 per group Ages 6 - 14 10 to 30 minutes
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In this activity (on pages 22-24 of the PDF), learners match extreme enviroments with life forms they support.

1 cent - $1 per group Ages 4 - 14 45 to 60 minutes
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In this activity, learners use tinfoil to build and test their own boats - which designs will float, and which will sink?

1 cent - $1 per student Ages 6 - 11 45 to 60 minutes
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In this outdoor activity and observation game, learners hunt for a variety of textures, colors, odors and evidence of organisms in the activity site.

$5 - $10 per group Ages 4 - adult 30 to 45 minutes
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This activity explores the basic workings of a siphon, which is the core technology that makes toilets work.

$1 - $5 per group Ages 8 - 14 10 to 30 minutes
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In this nutrition and estimation activity (page 12 of PDF), learners estimate serving sizes of different foods and compare their estimates to serving size information provided on nutrition food labels

$5 - $10 per group Ages 8 - 14 45 to 60 minutes
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In this activity, learners set up a night time insect observation station with a light and sheet.

$5 - $10 per group Ages 4 - adult 30 to 45 minutes
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In this activity, learners explore the history, design and motion of spinning tops. Learners work in teams of "engineers" to design and build their own tops out of everyday items.

$10 - $20 per group Ages 8 - 18 1 to 2 hours