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

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

This classic children's game demonstrates how sound travels through air vs. through a solid.

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

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

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 project, build an insect model that shows how the head, thorax, and abdomen fit together! Learn insect anatomy by constructing a paper mache critter.

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 the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

Using a toy race car kids create a visual model of the Doppler Effect.

How does a compass work? What's a magnetic field? Kids will build their own compass at home to find the answers in this great science fair project idea.

Children have a naturally inquisitive mind. Foster their curiosity with a walk through an autumn field or park to answer age-old “why” questions. As you walk with your child, you can encourage them to ask questions.

Why doesn't the ocean freeze? Students answer this question by simulating the chemical composition and temperature of arctic waters in their own home.

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

Saturn is the ringed planet in our solar system, a gas giant with rings made of ice and dust. Let's make a cool scale model with an old CD and some glitter!

While your cells are much too small to see without a microscope, you can create the look of a cell in your very own home with just an egg and vinegar!

How does the size of a vibrating surface affect the pitch of a drum? Learn about drum size and pitch with this easy science fair project idea.

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

How can we describe the relationship of magnetic field strength vs. distance? Kids will find out with this free science fair project idea.

Learn how to tell time by the sun with this cool science fair project idea that tracks how the accuracy of a sundial changes over time.

In this science fair experiment, children demonstrate the relationship between the amount of stuff and the amount of pressure in a closed system.

The moon doesn't produce its own light, so why can we see it shining in the sky? Learn about reflection and planetshine in this fun and easy science project!

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

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

Learn about savanna flora and fauna in this science project! Take a look at characteristics of tropical grassland plants and animals that help them survive.

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

The goal of this golf science fair science fair project is to determine whether the temperature of a golf ball affects its elasticity and its rebound.

In this science fair project, kids will be able to see where germs reside on their hands while gaining insight into the benefits of thorough hand washing.

This science fair project idea demonstrates how air resistance contributes to denser objects falling faster than less dense objects.

Test your friends to find out if you can replicate the placebo effect's incredible results.