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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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In this math lesson, learners use hinged mirrors to discover that regular polygons are composed of triangles tessellating around a center point.

1 cent - $1 per group Ages 8 - 11 1 to 2 hours
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This activity explores the main algorithms that are used as the basis for searching on computers, using different variations on the game of battleships.

1 cent - $1 per group Ages 8 - adult 30 to 45 minutes
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This great "re-use it" activity will demonstrate how to transform a greeting card into a box. Once constructed, the box can have many uses like holding special notes or keepsakes.

1 cent - $1 per student Ages 6 - 14 5 to 10 minutes
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Learners trace, cut out and fly a boomerang, outdoors or in a large indoor space.

1 cent - $1 per student Ages 4 - 14 10 to 30 minutes
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In this activity, learners will conduct an open-ended survey, and then organize and analyze results. What languages does everyone speak? What’s the most common? the least common?

1 cent - $1 per group Ages 6 - 14 5 to 10 minutes
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This simple construction activity teaches the importance of architectural structure. Learners build and test designs for a paper "doghouse" strong enough to hold the weight of a jumbo dog biscuit.

1 cent - $1 per student Ages 6 - 11 45 to 60 minutes
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In this activity (on pages 41-47 of PDF), learners explore tesselating geometric patterns (repeated shapes, similar to the art of M.C. Escher).

1 cent - $1 per student Ages 4 - adult 45 to 60 minutes
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In this game, learners build up six stacks of cards in the middle of the table, face up, in order from 1 at the bottom to 20 on the top. The first player to get rid of all his cards is the winner.

1 cent - $1 per group Ages 6 - 11 5 to 10 minutes
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In this activity, learners discover that they can modify a regular piece of paper so that it's large enough for them to walk through!

1 cent - $1 per student Ages 8 - 14 Under 5 minutes
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Align four color transparencies, each one a single color (cyan, magenta, yellow, and black), and see a beautiful full color image.

1 cent - $1 per student Ages 6 - 14 Under 5 minutes
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Learners cut and fold a paper helicopter from the template in this PDF. They practice twirling the helicopter and observe what happens as they modify their tries.

1 cent - $1 per student Ages 4 - 14 10 to 30 minutes
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In this activity (located on page 6 of the PDF), learners explore the ways people access water in their homes.

1 cent - $1 per student Ages 6 - 11 10 to 30 minutes
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Make a kite out of a garbage bag, shower curtain, painting tarp--anything light, thin, flexible and plastic!

1 cent - $1 per student Ages 6 - 14 45 to 60 minutes
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In this math puzzle game, learners work together to use algebraic reasoning and fun clues for solving word puzzles.

1 cent - $1 per group Ages 8 - 14 45 to 60 minutes
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Learners test their "light-smarts" by playing a game called "Light Quest!" The game board represents an atom and each player represents an electron that has been bumped into the atom's outer unstable

1 cent - $1 per group Ages 8 - 18 30 to 45 minutes
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Oboes's unique sound originates from the two small reeds a musician blows into. Make your own double reed instrument out of straw!

1 cent - $1 per student Ages 4 - 14 5 to 10 minutes
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In this activity, learners build a simple tabletop seesaw to test how different variables (the position of the fulcrum, distance, weight) affect its balance under increasing weight loads.

1 cent - $1 per student Ages 6 - 11 10 to 30 minutes
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In this tabletop activity (on pages 32-40), learners make Möbius strips -- 3D surfaces with only one side.

1 cent - $1 per student Ages 4 - adult 10 to 30 minutes
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In this simple exploratory activity (1st activity on the page), blindfolded learners try to identify mystery items by smell.

1 cent - $1 per group Ages 4 - 14 5 to 10 minutes