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In this math activity, each learner creates a book about themselves using a template. Learners discuss the different parts of the body and practice measuring their body parts using crayons.

1 cent - $1 per group Ages 4 - 6 30 to 45 minutes
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Learners set up books with rubber bands stretched between the books. When two identical books are stretched apart and released, they move back toward each other an equal distance.

1 cent - $1 per group Ages 11 - 14 30 to 45 minutes
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In this math lesson, learners explore probability.

$1 - $5 per group Ages 6 - 8 1 to 7 days
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In this activity (on pages 49-54 of PDF), learners play with tangrams, a set of triangles, squares and a parallelogram that can combine into a larger square as well as all sorts of other shapes.

1 cent - $1 per student Ages 4 - adult 45 to 60 minutes
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In this math lesson, learners play two different games to help them understand coordinates. First, learners read the book, "The Fly on the Ceiling," by Julie Glass.

1 cent - $1 per group Ages 8 - 11 30 to 45 minutes
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In this math lesson, learners rotate through six estimating and measuring centers. First, learners read the book, "Room for Ripley" by Stuart J.

free Ages 8 - 11 45 to 60 minutes
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In this math lesson, learners explore the concept of using units to measure length.

$1 - $5 per group Ages 4 - 6 45 to 60 minutes
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Learners examine the properties of light by experimenting with an LED-flashlight and polarizing filters. When two polarizers are used, they block all light when they are placed at right angles.

$10 - $20 per group Ages 11 - 14 10 to 30 minutes
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In this story time program, young learners listen to the Dr.

Over $20 per group Ages 4 - 11 10 to 30 minutes
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This activity introduces the idea of "divide and conquer" using a fictitious but serious problem--a pair of dirty socks has accidentally been wrapped in one of the presents that Santa is about to deli

free Ages 8 - 18 30 to 45 minutes
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Learners drop two different masses of play dough and observe how long it takes them to hit the ground.

$1 - $5 per student Ages 11 - 14 30 to 45 minutes
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Learners observe projectile motion by launching wooden balls off of a table top. They set up a rubber-band launcher so that each ball experiences a consistent amount of force.

$1 - $5 per group Ages 11 - 14 45 to 60 minutes
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Learners shine the light of a laser pointer through sheets of fabric that all have a different number of threads per inch.

$5 - $10 per group Ages 11 - 14 10 to 30 minutes
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In this math activity, learners read "The Button Box" by Margarette S. Reid and then make their own button boxes filled with different buttons.

$5 - $10 per group Ages 6 - 8 1 to 2 hours
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Learners build a pendulum from a yo-yo, and then design their own experiment to determine what affects the pendulum's period of swing.

$1 - $5 per group Ages 11 - 14 45 to 60 minutes
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This magic trick is based on how computers detect and correct data errors.

1 cent - $1 per group Ages 8 - adult 30 to 45 minutes
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In this activity on page 13 of the PDF, learners use a laser pointer (with known wavelength of light) to measure the thickness of a human hair.

$5 - $10 per group Ages 11 - 14 10 to 30 minutes
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In this activity, learners rotate through several learning and play stations to explore dinosaurs and paleontologists.

$5 - $10 per group Ages 4 - 6 45 to 60 minutes
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In this water activity, learners build boats that float and sink. First, learners listen to the book, "Who Sank the Boat" and practice making predictions throughout the story.

$5 - $10 per group Ages 4 - 6 45 to 60 minutes
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In this math lesson, learners explore tessellations through literature, music, writing, and art activities.

$10 - $20 per group Ages 6 - 8 1 to 2 hours