This science fair project idea demonstrates how air resistance contributes to denser objects falling faster than less dense objects.

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

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

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

Show your kids the power of baking powder by conducting a simple experiment. Make four batches of cornbread, all identical except for one thing: baking powder!

Find out whether a longer airplane will fly farther or a wider paper airplane.

This science fair project looks one of the most important factors affecting seed germination: water. A fun and easy plant biology experiment for 3rd graders.

Looking for an enjoyable evening activity you can do with your kids? Study the stars: help them learn about constellations by making one of their own.

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

In this physics project, learn about the relationship between light intensity and distance using a laser pointer, flashlight, and graph paper!

In this plastic wrap science fair project, you'll learn about polymer permeability and find out which plastic wrap keeps food from dehydrating best.

Science fair project that examines the different types of precipitation, evaluates the density of snow and calculates the ratio of snow-to-liquid.

This easy aerodynamics activity is a simple way to introduce kids to the scientific method.

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

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.

This cool science fair project teaches kids about temperature, density and buoyancy using balloons that float with normal air. No helium required!

This science fair project idea determines if the size of the parachute will change the rate at which an object falls.

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

This science fair project idea examines whether plants are still able to grow normally if they are turned upside-down.

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.

This science fair project idea investigates which objects float and sink in honey, water, and oil.

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

How powerful is the reaction between baking soda and vinegar? Find out here!

Teach your kids about entropy with this fun, easy exercise, and teach your money to dance while you're at it!

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.

In this activity, you'll not only make your own bouncy balls at home, but your child will also learn how polymers are made.

Encourage local wildlife to settle down in your backyard with this adorable bird nest craft.

This science fair project idea explores how the shape of a boat affects its density and how much weight it can float.

Your third grader will delight in learning about sound waves as he observes the different sounds created by tapping on glasses with varying amounts of water.