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

Kids will make a beautiful rainbow in a jar and learn what enables different types of liquids to remain distinct in separate layers.

Kids discover what a homogeneous mixture is by adding sugar to distilled water and identify the various factors affecting solubility.

What keeps a an item cooler, polymer crystals or ice? Find out in this cool science experiment!

Step into the fantastic world of colors with a project that explores what shade you -- and your friends -- like best.

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!

How do icicles form and what do they look like? Do this free science fair project and watch the formation of icicles occur right before your eyes.

What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.

What's the science behind those out-of-sight roots? Find out if you can trick roots into growing in different directions.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

This project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

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.

This science fair project investigates whether tapping the top or the side of the can will stop a vigorously-shaken can of soda from exploding.

Have you ever noticed the way a dropped stone makes a fun pattern in a pond or lake? What's the science behind these splashy occurrences?

Test whether plants can grow without sunlight and water.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

While your cells are much too small to see without a microscope, you can create the look of a cell in your very own home with just an egg and vinegar!

Ever wonder why refrigerator lights turn off when you close the door? Does the darkness prevent food from spoiling? This experiment, determines just that.

The objective of this science project was to build a model of a volcano and observe reaction between different substances, including baking soda and vinegar.

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

This science experiment has students test whether a snail moves faster on concrete or dirt.

Cleaning can be a chore, but not with this sudsy experiment!

Find out whether we can create motion in a dish and as a result, create a wonderful and colorful show.

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

Discover whether a metal will expand under hot water.

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!

Check out this fun science fair project idea for 1st grade: a solar eclipse model that demonstrates total, partial, and annular solar eclipses.

In this enlightening transpiration experiment, kids will explore how the loss of water from plants through transpiration contributes to the water cycle.

This science fair project idea explores whether white light can be separated into different colors.

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