This science project uses Mohsâ Hardness Test to show kids how to compare the hardness of different types of minerals.

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.

Can a toy car determine the strength of a magnet? In this cool magnet science fair project, young scientists will learn how to measure the strength of a magnet.

In this fun science experiment, kids will determine the best method for ripening avocados and discover the cool chemical reaction that makes this possible.

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

Learn about the role of Earth's rotation on the Coriolis Effect and hurricanes in this science project. Model the Coriolis Effect on a hurricane's direction.

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

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

In this science fair project, students use the streak test to tell minerals apart from each other.

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

Kids will learn how to show the direction of magnetic field lines and create a permanent model using iron filings in this great science fair project idea.

In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

Have you ever wondered how many numbers most people can memorize? Test your friends to find out!

What causes dilated pupils? Young scientists will find out by applying what they already know about changes in pupil size and making models of the pupil.

Crayons aren't just good for creating colorful masterpieces -- they're also great for science!

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

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!

In this classic Ivory soap experiment, kids learn what happens to different types of soap in the microwave, and why!

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!

Spiders don't go to grocery stores or fast food chains to get their food -- they set up traps and wait for their food to come to them!

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

Test whether plants can grow without sunlight and water.

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

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

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.

Is it a square or a circle? See if you can trick your friends with this zany science project!

Are you ready to be a detective for science? Then get out your magnifying glass and start studying fingerprints!

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

Observe how your brain works while it is focused on one thing, and how it works while you are distracted by another thing.