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In this activity, learners concoct some stretchy green goo called Gak. This activity will introduce learners to polymers, chemical reactions, and how scientists invent new materials.

$1 - $5 per student Ages 4 - 11 5 to 10 minutes
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This activity about cryptographic techniques illustrates how to accomplish a simple, but nevertheless seemingly impossible task—making a fair, random choice by flipping a coin between two people who d

$1 - $5 per group Ages 8 - 18 30 to 45 minutes
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Learners explore soybeans, soak them in water to remove their coat, and then split them open to look inside. They also make a musical shaker out of paper cups, a cardboard tube, and soybeans.

1 cent - $1 per student Ages 4 - 11 45 to 60 minutes
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In this outdoor activity, learners plan a simple foot path and create an environmental impact study of the natural area where the path would be.

$10 - $20 per group Ages 8 - 18 1 to 2 hours
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Build a house you can fit inside, using cardboard tubes.

1 cent - $1 per group Ages 6 - 14 45 to 60 minutes
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The goal of this Star Wars activity is to design and build a balancing device to help an Ewok escape the Imperial Forces by sliding down a tightrope to safety.

$10 - $20 Ages 8 - 18 30 to 45 minutes
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In this activity, learners use microarray technology to determine which genes are turned on and off at various points in the differentiation of pluripotent stem cells on their way to becoming pancreat

1 cent - $1 per group Ages 14 - adult 1 to 2 hours
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In this activity, learners will test cups full of potting soil, sand, and sphagnum moss to see which earth material is able to soak up the most water.

$5 - $10 per group Ages 8 - 14 1 to 2 hours
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With a bit of PVC, a laser, a can/cup, and a small mirror, you can make a device that visualizes you voice or any sound transmitted into the cup/can.

free Ages 8 - adult 10 to 30 minutes
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In this math lesson, learners apply the Monte Carlo method of simulation to determine a reasonable estimate.

$1 - $5 per group Ages 11 - 14 45 to 60 minutes
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In this math lesson, learners design an experiment to model a leaky faucet and determine the amount of water wasted due to the leak.

1 cent - $1 per group Ages 11 - 14 45 to 60 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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In this design challenge activity, learners build a four-stringed instrument that can play a tune.

$1 - $5 per student Ages 8 - 14 45 to 60 minutes
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In this activity, learners will engineer a roof using simple materials to protect a construction paper person from a rainstorm.

free Ages 6 - adult 10 to 30 minutes
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In this activity about human anatomy (page 16 of PDF), learners construct a model arm and discover how muscles and bones work together to achieve efficient movement.

$1 - $5 per group Ages 6 - 11 45 to 60 minutes
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These puzzles use four colors of socks in a drawer to get learners thinking algebraically.

1 cent - $1 per student Ages 8 - 14 30 to 45 minutes
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In this activity, learners construct a simple air pressure launcher for paper rockets.

$10 - $20 per group Ages 4 - 14 1 to 2 hours
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In this activity, learners explore the factors that tend to resist changes in pH of the ocean and why the ocean is becoming more acidic.

Over $20 per group Ages 14 - 18 1 to 2 hours
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In this activity/demo, learners examine a synthetic gecko tape with micron sized hairs that mimics the behavior of the gecko foot.

Over $20 per group Ages 6 - adult 10 to 30 minutes
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In this activity, learners explore how an electromagnet works by making a simple one. Using this knowledge, learners design a diagram to make a working speaker using household materials.

$10 - $20 per group Ages 11 - 14 45 to 60 minutes