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This activity lets you program your 'robot' (a willing friend) to pick up and dispose of some 'toxic waste' using as few commands as possible.

1 cent - $1 per group Ages 8 - 18 10 to 30 minutes
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This design challenge is an open-ended exploration of linkages, a group of parts connected by hinges, and the types of motion they can create.

$1 - $5 per student Ages 8 - adult 10 to 30 minutes
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Learners construct an electricity-generating wind turbine out of a plastic bottle.

Over $20 per group Ages 11 - 18 2 to 4 hours
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Learners use shop tools and various materials to construct a magnetic spinner and a compass.

$1 - $5 per student Ages 8 - 14 1 to 2 hours
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In this engineering challenge, learners design and build a crane out of cardboard to see how heavy a load it can lift.

$1 - $5 per group Ages 11 - 18 45 to 60 minutes
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In this environmental science lesson, learners will examine the dangers of mercury and how humans contribute to growing mercury emissions on Earth.

$5 - $10 per group Ages 14 - 18 1 to 2 hours
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In this activity, learners explore how the hull shape impacts a ship's performance and stability.

$10 - $20 per group Ages 11 - 18 2 to 4 hours
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Somatic Cell Nuclear Transfer (SCNT) is a cloning method that involves transferring a nucleus from a somatic cell of the individual to be cloned to an enucleated egg.

1 cent - $1 per group Ages 11 - 18 1 to 2 hours
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Learners take on the role of environmental engineers as they design water filters.

$5 - $10 per group Ages 11 - 14 45 to 60 minutes
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In this activity, learners build inexpensive pulley assemblies from pulley wheels used for sliding screen door replacement or from clothesline spreaders.

$10 - $20 per group Ages 11 - 18 1 to 2 hours
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In this activity, learners create a "Jam Jar Jet" based on Francois Reynst's discovery of a pulsejet engine, which uses one opening for both air intake and exhaust.

$10 - $20 per student Ages 14 - adult 2 to 4 hours
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In this activity (on pages 18-29) learners explore the impact of the March 24, 1989 oil spill in Alaska caused by the Exxon Valdez tanker.

$5 - $10 per group Ages 8 - 14 1 to 2 hours
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This is an activity (located on page 3 of the PDF under Water Clean-up Activity) about the use of reduction agents to decontaminate ground water.

$10 - $20 per group Ages 8 - 14 2 to 4 hours
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In this activity, learners explore the engineering design process (EDP)—the process engineers use to solve design challenges.

$5 - $10 per group Ages 8 - 18 1 to 2 hours
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In this activity/demo about piezoelectricity, learners discover how some crystals produce electricity when squeezed.

Over $20 per group Ages 4 - adult 10 to 30 minutes
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In this drawing/mapping activity, learners design plots of land while incorporating positive strategies for improving water quality.

$5 - $10 per group Ages 11 - 14 1 to 2 hours
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In this activity, learners design, build and test wind turbines. Learners go through the design process and use the scientific method to test important blade variables.

Over $20 per group Ages 8 - 18 2 to 4 hours
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Using a vertical wind tube and using simple materials, individuals and groups attempt to design a "satellite" that floats for at least 5 seconds.

$1 - $5 per student Ages 4 - adult 30 to 45 minutes
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In this activity, learners discover that one way to cool an object in the presence of a heat source is to increase the distance from it or change the angle at which it is faced.

1 cent - $1 per group Ages 8 - 14 1 to 2 hours
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This activity (on pages 38-43) has learners simulate the way scientists track and map the movement of otters in the wild using radio trackers.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes