What is a wedge? Kids find out by experimenting with different wedges in this simple science fair project idea.

In this experiment, your child will create two compost bins and see if he can determine what attracts fruit flies.

Be a chemist for a day and study the simple reaction between sugar and heat. Try heating sugar and see what happens!

What animals are most popular? This project affords practice in data-collection, record-keeping and data-analysis through the investigation of this question.

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.

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.

Science fair project that demonstrates the effect of detergent pollution on fresh water birds' ability to stay afloat.

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

This project examines whether people's taste perception is influenced by what they see.

This project determines what category of person is most likely to be ticklish.

How do organic materials become soil? This science experiment measures what materials biodegrade.

Kids will make a beautiful rainbow in a jar and learn what enables different types of liquids to remain distinct in separate layers.

Step into the fantastic world of colors with a project that explores what shade you -- and your friends -- like best.

Science fair project that examines what causes thunder and why a thunderclap sounds so loud. How is lightening related to the creation of sound waves?

What's the science behind those out-of-sight roots? Find out if you can trick roots into growing in different directions.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

This project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

This is a quick, easy science fair project that conveys the idea of density to preschool and early elementary children.

Test whether plants can grow without sunlight and water.

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.

This science experiment has students test whether a snail moves faster on concrete or dirt.

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

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

Use pepper and soap to discover some fun facts about the properties of water.

This science fair project idea investigates emulsifiers that allow oil and vinegar to mix.

This science fair project teaches about mold. Students will test different foods to see which grow mold the fastest.

In this project children practice the scientific method while playing with puffy paint.

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

Milk is made of water and fat; but how can you separate the two? Find out in this color changing milk experiment.