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This design challenge is an open-ended exploration of linkages, a group of parts connected by hinges, and the types of motion they can create.

$1 - $5 per student Ages 8 - adult 10 to 30 minutes
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In this activity (on page 2 of the PDF under GPS: Sailboat Design Activity), learners will discover how the shape of an object, not just its weight, determines whether it floats or sinks.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes
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In this activity (pages 3-4), learners investigate the properties of smart materials, which are materials that respond to things that happen around them.

$5 - $10 per student Ages 8 - adult 10 to 30 minutes
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Play with your food while learning about engineering! Build a spaghetti bridge, then test its strength by piling on the marshmallows, raw spaghetti, raw linguine and coins.

$1 - $5 per student Ages 8 - 14 10 to 30 minutes
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In this quick activity (page 1 of the PDF under SciGirls Activity: Tug O' War), learners will test how many pennies a flat paper index card bridging the gap between two stacks of books is able to supp

1 cent - $1 per group Ages 8 - 14 10 to 30 minutes
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In this activity (page 1 of the PDF under SciGirls Activity: Water Slides), learners will whip up some suds with a cup of water and a tablespoon of dish soap until the bubbles are stiff enough to star

1 cent - $1 per group Ages 8 - 14 30 to 45 minutes
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In this activity, learners explore the concepts of structural engineering and how to measure the critical load, or the maximum weight a structure can bear.

$1 - $5 per group Ages 8 - 14 1 to 2 hours
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In this hands-on activity, learners investigate the functional design of leaves on a tree.

$1 - $5 per group Ages 8 - 14 1 to 2 hours
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In this design challenge activity, learners build a tower that can support a tennis ball at least 18 inches off the ground while withstanding the wind from a fan.

1 cent - $1 per student Ages 8 - 14 30 to 45 minutes
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In this engineering/design/arts and crafts activity, learners design and build "platforms" or "bridges" that can hold weight, and test which glue makes the strongest structure.

$1 - $5 per student Ages 6 - 14 1 to 2 hours
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In this activity (pages 13-14), learners investigate the properties of smart materials, which are materials that respond to things that happen around them.

$5 - $10 per student Ages 8 - adult 10 to 30 minutes
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No glue is needed for learners of any age to become marshmallow architects or engineers.

1 cent - $1 per student Ages 4 - 14 30 to 45 minutes
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In this activity (pages 8-9), learners investigate the properties of smart materials, which are materials that respond to things that happen around them.

$5 - $10 per student Ages 8 - adult 10 to 30 minutes
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In this activity (page 4), learners work in groups to plan and build large structures using recyclable materials they have brought from home.

$1 - $5 per group Ages 6 - 14 30 to 45 minutes
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In this design challenge activity, learners invent an emergency shelter that can fit a person and is sturdy and quick to build.

$10 - $20 per group Ages 8 - 14 30 to 45 minutes
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In this activity, learners use Teflon (PTFE) tape to write secret messages.

$1 - $5 per student Ages 6 - 18 10 to 30 minutes
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In this activity, learners explore different ways to stack cups to meet a personal goal.

$1 - $5 per group Ages 4 - 14 10 to 30 minutes
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This is a quick activity (on page 2 of the PDF under Hockey Sticks Activity) about how the arrangement of carbon atoms determines carbon's different properties.

1 cent - $1 per group Ages 8 - 14 10 to 30 minutes
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In this activity about saturation (page 1 of PDF under SciGirls Activity: Sand Dunes), learners will build a series of sand castle towers using a 16 oz cup.

$5 - $10 per group Ages 8 - 14 45 to 60 minutes
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This activity (on page 2 of the PDF SciGirls Activity: Milk Carton Boat) is a full inquiry investigation into boat hull design.

$10 - $20 per group Ages 8 - 14 4 to 24 hours