Do different types of oil mix or stack? Find out in this science fair project idea!

In this fun science project, learn about what happens to cut fruit and experiment with how to stop apples from turning brown.

This science fair project idea measures out the sugar of various foods and find out whether people can correctly determine how much sugar is in common foods.

This simple "how to make a water wheel" activity makes physics come alive for your child by demonstrating how different kinds of energy work.

Learn how to make a weathervane with this fun and simple meteorology project for fourth graders.

How does distance affect the spreading of light? Kids see diffraction and the inverse square law of light in action with this great science fair project idea.

This science fair project explores how osmotic pressure forces water through the root up into the plant.

Learn how to tell time by the sun with this cool science fair project idea that tracks how the accuracy of a sundial changes over time.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

Kids will learn how to make a thermometer to to explore liquid density in this great science fair project. Which liquids are affected by temperature the most?

This recipe makes bubbles that not only blow up nice and big, but do tricks and experiments! How do you do it? It's not a secret, it's science!

Kids learn how to prevent erosion by growing grass. They'll test soil with grass against raw soil in this revealing science fair project idea for 4th grade.

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

In this experiment you observe and determine how well your cat uses his whiskers to navigate through a maze.

Children will learn why and how to compost as they help with the process of filling their compost, turning it, and observing the changes that occur.

The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

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.

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

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.