In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

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

This science fair project idea examines which type of insulation holds in the most heat.

This science fair project idea teaches how the gases and pollution in the air affect the earth's atmosphere temperature.

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

Check out this cool science fair project idea that models the behavior of the cold desert plants: xerophytes and halophytes.

Understanding absorption means understanding why certain fibers and materials can absorb water! Kids will see absorption in action in this simple project.

Did you know your body is full of simple machines? This project looks at one of the third-class levers in the human body: your arm!

This science fair project idea explores the egg's thin membrane.

In this enlightening transpiration experiment, kids will explore how the loss of water from plants through transpiration contributes to the water cycle.

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

When you rub a balloon on your head, your hair stands up; but is that true for everyone? Does hair color affect static electricity?

How do animals keep warm? In this experiment, find out whether fat insulation resists cold temperatures and learn how this works in the animal kingdom.

Did you even wonder why some rocks are round and smooth while others are broken up into small pieces?

What is a compound microscope? Kids find out by making one of their own in this cool science fair project.

Kids will make predictions about cricket behavior by conducting this fun and easy experiment which simulates different environments for crickets.

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

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

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

How do icicles form and what do they look like? Do this free science fair project and watch the formation of icicles occur right before your eyes.

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

Can a horse lead itself to the carrot? Train your horse with carrots and boxes and test horse memory in this fun zoology science fair project.

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!

Learn about this simple machine and make a pulley of your own to use for fun science trials.

This project determines whether Styrofoam, paper, or plastic cups are best for preventing ice from melting.

Discover whether cold or hot water from the faucet will boil faster on the stove.

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

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

Why does honey crystallize? This science fair project project answers this question and identifies the variable that makes this sweet solute crystallize faster.

Science fair project examining barometric pressure, and how it can be used to predict the weather. How does atmospheric pressures relate to weather conditions?