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Information Hiding: Sharing Secrets
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This activity about cryptographic techniques illustrates a situation where information is shared, and yet none of it is revealed.

Bookshelf
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In this activity, learners use simple tools to build a bookshelf with a built-in bookend.

Electroplating
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In this activity, learners electrically plate zinc onto brass objects.

Boats Afloat
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In this activity, learners discover what buoyancy is and determine the characteristics that make an object buoyant. Learners design, build, test, and evaluate boats made from a variety of materials.
Windmills
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In this physics activity (page 8-9 of the PDF), learners will explore wind energy. They will build their own windmill and see how energy from wind can be converted into a useable form.

So Many Parts
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In this online Flash game and spacewalk mission simulation, learners are challenged to repair parts of a space station while balancing their oxygen and fuel use carefully.

Geodesic Gumdrops: Candy and Toothpick Architecture
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This hands-on activity shows you how to build basic architectural shapes out of toothpicks and gumdrops.

Exploring Forces: Gravity
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In this nanoscience activity, learners discover that it's easy to pour water out of a regular-sized cup, but not out of a miniature cup.

Three Little Pigs
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In this activity, leaners explore building techniques by recreating the story of The Three Little Pigs.

Design a Parachute
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After a discussion about what a parachute is and how it works, learners create parachutes using different materials that they think will work best.
Butterflies in Space
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The Butterflies in Space Teacher's Guide uses "life in space" to encourage learners to conduct their own open-ended scientific investigations.
We Have Capture!
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Using simple materials, learners will construct the end effector (grasping device) of a robotic arm and use the device to capture and pick up an object.

What's in a Penny?
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In this chemistry activity, learners use chemical reactions to observe the composition of an alloy.

Trail Construction
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In this highly physical outdoor activity, learners construct and compare experimental trail sections to select the best trail-construction technique for their site.

Milk Carton Boats
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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.

Beat the Clock: Sorting Networks
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Even fast computers are limited to how quickly they can solve problems. One way to speed things up is to use several computers at once.

Make a Model of a Home Made From Shipping Containers
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In this activity, learners watch a video to learn about a couple who built a home out of shipping containers in Brooklyn, New York.

Cutting it Down to Nano
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This simple activity uses paper and scissors to convey two key concepts to learners: the nanoscale is very small and working on the nanoscale requires special tools.

Shimmering Lenses
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In this activity, learners use Jell-O to explore lenses. Learners cut Jell-O into convex and concave lens shapes and examine how light exits each lens in a darkened room.

Finger Basketball
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In this activity, learners build mini-basketball courts using cardboard and measuring spoons. Use this activity to introduce learners to catapults, forces, and levers.