In this science fair project, learn how to make gears and find out why they transmit torques in predictable ways.

Learn how to make a hygrometer to measure relative humidity in this project. Make a sling psychrometer hygrometer with gauze, thermometers, and a bottle.

Demonstrate how you can make your own compass using a magnetized needle. It also allows you to compare magnetic north and geographic north.

Create safe lightning for kids! They'll learn how to make lightning at home with this fun science fair project idea illustrating static charges and grounding.

This basketball project explores the best way to make the perfect shot every time.

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 hands-on design challenge your child will make their very own Rube Goldberg Machine.

Kids get step-by-step instructions for how to make a rubber band car and explore the physics of potential energy with this fun engineering science fair project.

This science fair experiment idea's objective is to understand the general concept of an acid and a base.

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

This science fair project explains the process of how the lungs expand and contract with the help of the diaphragm.

Construct batteries that make electricity from fruits with this fun science fair project.

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.

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

In this design challenge, your child will make a bottle rocket using typical household items.

In this science fair project, kids start a chemical reaction that will make a balloon inflate itself!

Science fair project idea which teaches you how to make butter by separating cream into butter and buttermilk.

Discover that the absorbency of fabrics depend largely on the shape and structure of the individual fibers that make up the fabric.

Science fair project which teaches you how to make your own homemade glue by combing curdled milk with baking soda.

Kids will discover the meat science behind the meat they eat, and find out how to use safe chemistry to make meat more tender.

Science fair project that teaches you about chemical indicators and how to make your own in order to identify various mystery solutions.

Little scientists will make inferences about hearing loss, pitch, and frequency in this great science fair idea that puts the human ear to the test.

What cause the phases of the moon? Make a model to see how the positions of the Sun, Moon, and Earth cause the crescent, gibbous, quarter, full, and new moon.

Kids make a paperclip perform an act of magnetic levitation and test how effective various materials are at magnetic shielding in this science fair project.

Kids learn about potential energy, and mechanical energy, and how to make power from water with one of our favorite renewable energy projects for kids.

Young physicists will wrestle with a discrepant event: the Hammer Ruler Trick. They'll make some inferences about torque, balance, and center of gravity.

In this science fair project, students learn how pressure can make the minerals in a rock line up in the same direction and form bands and foliation.

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.

Glass is see-through, but usually you can still see that it is there. In this experiment, we use baby oil to make glass go completely invisible.

Check out this fun science fair project to make a vinegar and baking soda balloon and demonstrate how gas is created as a result of the chemical reaction.