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

This project compares the strength of one, two, and three-ply toilet paper.

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

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

Young scientists will investigate people's preferences for saltiness, and make some inferences about genetics and diet.

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

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

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.

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

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.

Most people assume that cold water freezes more quickly, but could that be false? Does hot water freeze faster than cold water? Let's find out!

In this science fair project, we'll use a liquid crystal thermometer to find out whether exercising makes a difference in people's temperature.

Learn about magnifying glasses, concave lenses and inverted images by sending rays of light through a magnifying glass in this cool science fair project!

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 create their own miniature salt flats at home.

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

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

Do you think heat can affect a plant's growth rate?

This science project teaches young students about germs, bacteria, and the importance of washing their hands. Students will test what is the best way to wash.

Kids will learn some cool stuff about chemical reactions by determining what happens when you mix different concentrations of hydrogen peroxide and yeast.

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

In this project, learn about animal vision and different kinds of eyes: ocelli, compound eyes, and camera eyes. Find out what a jellyfish or grasshopper sees!

How well can people recall what they have observed. Test your knowledge in this fun experiment.

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

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

Certain fruits can change gelatinâs ability to set. In this experiment, kids will discover what happens when gelatin meets pineapple enzyme.

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

This science fair project teaches students about wilting and browning of salad greens.

Kids will learn about the interaction of lactose and lactase in milk and discover why we describe enzymes as catalysts in this fun science fair project.

Is it magic? No...it's the amazing, gravity-defying capillary action experiment! Kids will love this dramatic and enlightening science fair project.