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In this simulation activity, learners will raise a pack of wolves under ten different conditions: without human interference and with human interference.

1 cent - $1 per group Ages 8 - 14 45 to 60 minutes
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This lesson familiarizes learners with the term "tropical belt." First, learners locate the equator, Tropic of Cancer and Tropic of Capricorn on a map and trace these lines with a crayon.

$1 - $5 per group Ages 4 - 11 45 to 60 minutes
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In this activity, learners explore the concept of friction and how ball bearings reduce friction.

$1 - $5 per group Ages 8 - 18 45 to 60 minutes
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In this activity, learners explore the "nuts and bolts" of gene chips.

$1 - $5 per student Ages 14 - 18 45 to 60 minutes
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In this math lesson, learners use simple addition facts to compute values (in dollars and cents) for their names.

1 cent - $1 per group Ages 6 - 8 45 to 60 minutes
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In this activity, learners role-play the part of lake inhabitants and the aquatic exotics who displace the native species.

$10 - $20 per group Ages 8 - 14 45 to 60 minutes
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In this activity (page 18 of PDF), learners will measure the volume of impact craters created by projectiles of different masses.

$10 - $20 per student Ages 8 - 14 45 to 60 minutes
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Learners draw and cut out shapes of organs from construction paper. Then they attach these organs to the body of one learner to make a life-sized map of all the internal organs.

$1 - $5 per group Ages 8 - 11 45 to 60 minutes
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In this computer science activity about finite-state automaton (on page 45 of the PDF), learners use a map and choose various pathways to find Treasure Island.

1 cent - $1 per student Ages 8 - 14 45 to 60 minutes
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In this physical sciences activity, learners use science to solve a "crime." Learners collect trace evidence (glitter) and explore its characteristics, such as color, size, shape, and light reflection

$10 - $20 per group Ages 8 - 14 45 to 60 minutes
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In this activity (on page 1), learners role play as atoms to explore how atoms can be rearranged to make different materials.

1 cent - $1 per group Ages 8 - 14 45 to 60 minutes
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In this activity (page 10), learners explore how molecules self-assemble according to forces of attraction and repulsion.

Over $20 per group Ages 11 - 14 45 to 60 minutes
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In this hands-on and feet-on excursion, learners take a science walk to visualize the planet's immense size and numerous structures, without the usual scale and ratio dimensions found in most textbook

1 cent - $1 per group Ages 11 - 18 45 to 60 minutes
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In this technology activity, learners explore digital imaging and pixels. Learners "transmit" an image to a partner by creating an image on grid paper.

1 cent - $1 per group Ages 8 - 14 45 to 60 minutes
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In this classic memory game (on pages 37-45 of PDF), learners turn over tiles to reveal images on the back.

1 cent - $1 per group Ages 4 - 11 45 to 60 minutes
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Make your own "Dance Dance Revolution" dance pad! In this design challenge activity, learners work in teams to build a dance pad that lets you use your feet to sound a buzzer or flash a light.

$10 - $20 per group Ages 8 - 14 45 to 60 minutes
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In this activity, learners follow step-by-step instructions to build a gel electrophoresis chamber using inexpensive materials from local hardware and electronic stores.

Over $20 per group Ages 11 - 18 45 to 60 minutes
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Learners classify a variety of objects by their characteristics. They then design an experiment to determine which objects float or sink in water and add this characteristic to their classification.

$5 - $10 per group Ages 8 - 11 45 to 60 minutes
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In this simulation of natural selection, learners use binder clips in three different sizes to represent the diversity of beak sizes in a bird population.

$5 - $10 per group Ages 11 - 18 45 to 60 minutes
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In this activity, learners make or use pre-made clay beams to scale and proportion. Specifically, they discover that when you scale up proportionally (i.e.

$10 - $20 per group Ages 4 - 14 45 to 60 minutes