This science fair project idea determines if the color of light affects the growth of plants.

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

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

Experiment with buoyancy to learn how a submarine rises and sinks in this classic science experiment.

Science fair project which measures whether tsunamis are more destructive when they are caused by an earthquake or by a meteor.

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

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

Kids will learn how to make a steam powered rocket boat, also called a putt putt boat or a pop pop boat, in this great science fair project for 4th graders.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

Can you imagine a sky filled with bright, colorful bubbles? Make this whimsical scene come alive with bubble science!

This science fair project idea explores whether factors such as temperature and concentration affect the pH of a solution.

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

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

How does a flashlight work? Kids will make a complete circuit and explore how voltage contributes to brightness with this science fair project idea.

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

How do series and parallel circuits work, and which produces the brightest light in a light bulb? Construct both in this project and find out!

This project examines Newton's First and Second Laws of Motion with a bicycle and water balloons.

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!

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

Do you love to make Jell-O? Find out in this science fair project idea if it is possible to make Jell-O with just warm water.

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

Explore how dielectric heating comes into play when microwaving various liquids in this science project. This test will help you understand how microwaves work!

This science project has students study a group of volunteer liars actively lying to study the behavior of a lie. Students see if they can figure out the truth.

In this fun science project, learn about what happens to cut fruit and experiment with how to stop apples from turning brown.

Explore how sound waves are reflected and absorbed by producing echoes. Analyze which locations produce echoes.

Find out which type of sponge holds the most water.

This project examines whether playing music during class helps students learn or if it distracts students from learning.

Do hand soaps and sanitizers prevent the growth of bread mold? If so, why? Kids will find out with this fun and informative science fair project idea.

The objective of this science fair project is to examine the basic principles of air pressure using simple materials like a balloon, straw and string.

Would it hurt to skip brushing your teeth just this once? Let's find out by seeing which foods produce the most mouth bacteria.