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

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

How do mirrors work? What is light, and how does it travel? Explore light and reflection with your preschooler with these simple hands-on experiments.

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.

Slime: It's oozy, it's goopy, and it's just plain fun! Learn how to make slime with this fun science fair project.

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

The goal of this fun science fair project idea is to microwave candy and investigate: do some colors of M&Ms melt faster than others?

This science fair project idea teaches that time always passes at the same rate and nothing we do in our daily life âreallyâ affects how fast it moves.

This classic children's game demonstrates how sound travels through air vs. through a solid.

How do organic materials become soil? This science experiment measures what materials biodegrade.

Learn the basic structure of a DNA strand, which is the double helix, how genes form together, and the resemblance DNA has to a twisted ladder. Create a model.

How do you tell time without a watch? Use the sun! This simple activity will show your child how to build his own sundial.

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

In this cool experiment, learn how to find specific gravity of minerals using liquids of different densities to see which substances and items sink and float.

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

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!

Learn about lateral earthquake motion and its effect on high rise buildings in this simple 4th grade earth science experiment.

Here's an easy experiment that lets your first grader practice the scientific method, while watching a caterpillar eat.

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.

Explore if planting seeds in a certain direction will affect how fast it germinates.

It's not actually that hard to get energy from garbage! Kids learn how to make biogas in the form of methane with this cool and easy science fair project idea.

Create a homemade pair of sunglasses with colored lenses to see just how light and color affect our sight! Use this fun project to practice science!

Dinosaurs were huge creatures that left behind huge footprints that lasted for millions of years. In this science fair project, kids learn how dinosaur tracks were left behind!

Demonstrate how to tell the age of an egg without having to crack it open.

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

Take a look at forensic science with your child. She'll learn how to take a shoe impression, just like the detectives do!

How greasy are your potato chips? Students will use a reliable method to quantify greasiness and compare different brands in this great 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 science fair project, we'll explore how blocking the sun's light can stop those can stop photosensitive paper from changing color.

Do this activity to help your kids see how seeds contain "baby" versions of big plant stems, roots, and leaves.