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Butter Up
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In this activity, learners will discover how to make butter from scratch. One optional tips includes adding marbles to speed up the process.

Exploring Size: Memory Game
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In this activity, learners play a card game that explores different size scales--macro, micro and nano.

Spaghetti Strength
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In this activity on page 7 of the PDF, learners explore how engineers characterize building materials.

Nature Journals
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In this activity, learners construct a home-made journal with simple, everyday materials.

Sea Turtle First Aid Investigation
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This activity (located on page 4 of the PDF under GPS: Sea Turtles Activity) is a full inquiry investigation into testing a repair material.

Racing with the Sun: Creating a Solar Car
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Learners use engineering design principles to construct and test a fully solar-powered car. Solar car kits usually include a photovoltaic cell and motor; some include a chassis as well.

Hot Stuff!: Creating and Testing for Carbon Dioxide
In this demonstration, learners observe vinegar and baking soda reacting to form carbon dioxide (CO2) gas.

How to Make an Audio Tape Bow
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From this How To slide show, you create an Audio Tape Bow that can play distorted audio sounds by running it across a tape head.

Sugar Crystal Challenge
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This lesson focuses on surface area and how the shape of sugar crystals may differ as they are grown from sugars of different coarseness.

Hot Cans and Cold Cans
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Learners apply their knowledge of heat transfer to design two cans - one that will retain heat and one that will cool down quickly.

Bone Basics
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This is an activity (on page 2 of the PDF under Bone Regrowth Activity) about the two main components of bone - collagen and minerals (like calcium) - and how they each contribute to its flexibility a

The Carbon Cycle: Carbon Tracker
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In this activity, learners play NOAA's Carbon Tracker game and discover ways to keep track of carbon dioxide and other greenhouse gases in the world.

Don't Throw it in the Garbage
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In this activity, learners discover why only some types of plastic can be recycled.

Headphone Helper
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In this design challenge activity, learners add headphones to a previously built instrument (see "Build a Band" activity) to make it easier to hear.

Paper Tape Motion Timer
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In this activity, learners build a recording timer made from simple materials (e.g., small dc motor, sharpie pen, craft sticks, adding machine paper tape, etc.).

Cookie Surface Area
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This is an activity (on page 2 of the PDF under Surface Area Activity) about surface area to volume ratio.

Breaking Beams
Learners investigate stress and strain by designing, building, and testing beams made from polymer clay.

Oil Spill Cleanup
This hands-on experiment will provide learners with an understanding of the issues that surround environmental cleanup.

As the Rotor Turns: Wind Power and You
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In this engineering activity, learners will get acquainted with the basics of wind energy and power production by fabricating and testing various blade designs for table-top windmills constructed from

Tug-of-War
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This activity (on page 2 of the PDF under SciGirls Activity: Tug O' War) is a full inquiry investigation into tug-of-war physics. Groups of learners will test two tug-of-war strategies.