In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

This science fair project creates a visual model of whatâs happening to sound waves as a car approaches and then leaves.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

What's the relationship between temperature, air humidity and static electricity? Kids will find out with this free static electricity science fair project.

What's the difference between a microwave and an oven? Use mashed potatoes to explore which kitchen appliance does a better job at keeping food warm.

What causes the seasons to change? Kids find out by modeling the earth's tilt using a globe, flashlight and graph paper in this cool science fair project idea.

Have you ever noticed the ridges on a dog's nose? In this project, we take several dogs' nose prints and discover just how unique they are!

In this science fair project, students discover how sedimentary layers form as sediments like mud, silt and sand settle over time.

Magnets vary in strength. Have your young scientist figure out which kind of magnet is the strongest when you have him conduct this attractive experiment.

In this science fair project, students make their own rain gauge to measure rainfall.

Get this cool science fair idea to explore how arctic tundra animals change their behavior and adapt to survive in long, cold winters.

Did you ever add salt to pasta? Did it help cook the pasta faster? If not, find out in this science fair project idea.

In this science fair project, kids start a chemical reaction that will make a balloon inflate itself!

Science fair project idea examines validity of mood ring predictions. Analyze accuracy of results, consider the impact of temperature

In this CD hovercraft science project, students will construct their own DIY hovercraft.

This experiment has students record rat behavior to learn about the benefits of rats and research rat myths throughout history.

This science fair project teaches kids experimental design and how to test if subjects can really sense if they are being watched.

This light bulb science project includes step-by-step instructions for testing the heat from different light bulbs.

Future engineers, unite! Discover how to keep a sandcastleâs bridge from falling into the moat.

Would your dog prefer homemade or store-bought food? Raw or cooked? Test your dog's preferred diet in this fun experiment.

Test out the pH levels of soil in your backyard versus soil in more wild environments to solve this science case.

Could there be toxic chemicals lurking in the cupboards and closets of your home?

In this science fair project, you'll make a "ghost" appear in a test tube, and learn about what happens when hot water and cold water interact.

The purpose of this science fair project is to determine which conditions and materials quicken the composting process to make the best compost.

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

The project determines determine if a sports drink affects the heart rate of a student athlete during exercise.

Can you increase the light and plant growth in your garden using mirrors? In this experiment, measure light reflection and find out!

The science project fair idea explores the interaction between your nose, mouth, and brain when tasting a new food or drink.

This science project challenges students to learn about and classify weeds and discover new practical uses for weeds.

In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.