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In this activity about encryption, learners cut out a secret decoder badge from a handout and use it to encode messages to each other.

1 cent - $1 per student Ages 8 - 14 30 to 45 minutes
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This is an activity (located on page 3 of the PDF under Self-Assembly Activity) about self-assembly, the ability of molecules to assemble themselves according to certain rules.

$10 - $20 per group Ages 8 - 14 1 to 2 hours
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In this design challenge activity, learners build a car that can travel at least four feet using rubber band power and use the design process to debug problems.

$1 - $5 per student Ages 8 - 14 30 to 45 minutes
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In this activity, learners explore how the area of Arctic sea ice has changed over recent years. First, learners graph the area of Arctic sea ice over time from 1979 to 2007.

free Ages 11 - 18 45 to 60 minutes
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The goal of this activity is to design, build and test a house or toy for an animal.

$1 - $5 per group Ages 4 - 18 30 to 45 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 activity on page 3 of the PDF, learners visualize the relative size and structural differences between microbes that have the potential to cause disease.

$10 - $20 per group Ages 11 - 18 1 to 2 hours
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In this sports-themed engineering activity, learners create super bouncy balls out of balloons. Learners brainstorm, test their designs, and share results.

$1 - $5 per group Ages 8 - 14 30 to 45 minutes
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In this activity, learners work individually to assemble a product and then work in teams to design, construct, test, and redesign an assembly line process whose product must meet specific quality con

$1 - $5 per group Ages 8 - 18 1 to 2 hours
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In this activity, learners explore scale by using building cubes to see how changing the length, width, and height of a three-dimensional object affects its surface area and its volume.

1 cent - $1 per student Ages 11 - 14 10 to 30 minutes
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In this activity, learners are challenged to design and construct a windmill to harness the power of wind.

Over $20 per group Ages 8 - 18 30 to 45 minutes
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In this series of activities (page 5), students are introduced to the design process.

$10 - $20 per group Ages 11 - 18 2 to 4 hours
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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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In this activity, "write" a secret message in genetic code as beads on a string.

$1 - $5 per student Ages 11 - 18 30 to 45 minutes
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In this three/four-day lesson, learners calculate perimeters and areas and draw the castle plan to scale.

$5 - $10 per group Ages 8 - 14 1 to 7 days
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In this design challenge activity, learners make a balloon hover at eye level for five seconds, and then make it move by creating air currents.

$1 - $5 per student Ages 8 - 14 45 to 60 minutes
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In this design challenge activity, learners build a car that uses a battery-operated motor to "drive" at least ten feet.

$5 - $10 per student Ages 8 - 14 30 to 45 minutes
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This activity is a hit for family events and all ages—some will finish in 45 minutes; others can go on for hours.

1 cent - $1 per group Ages 6 - 14 45 to 60 minutes
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In this activity (page 12), learners apply the concepts of pixilation and pointillism to the world of biomedical science.

$5 - $10 per group Ages 11 - 14 1 to 2 hours
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In this environmental engineering activity, learners build windmills using everyday items. The first challenge is to build windmills that spin when placed in front of a fan.

$10 - $20 per group Ages 8 - 14 2 to 4 hours