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

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

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

Did you even wonder why some rocks are round and smooth while others are broken up into small pieces?

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

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

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

When you cut a flower to put into a vase, it'll eventually wilt, even with water and sunshine. But is there another scientific secret to keeping flowers fresh?

In this science fair project, kids will be able to see where germs reside on their hands while gaining insight into the benefits of thorough hand washing.

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

This is a quick, easy science fair project that conveys the idea of density to preschool and early elementary children.

Kids will conduct a cool limewater carbon dioxide test that can be performed with common household materials to learn about the chemistry of this common gas.

In this science fair experiment, children demonstrate the relationship between the amount of stuff and the amount of pressure in a closed system.

How do animals keep warm? In this experiment, find out whether fat insulation resists cold temperatures and learn how this works in the animal kingdom.

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?

In this science fair project, kids observe the expansion of liquids when frozen and determine if some liquids expand more than others in the freezing process.

Is it possible to trick the forces of nature that make your bubbles round to create a square bubble?

This engaging project encourages young children to practice and refine the important scientific skills of sorting and classification.

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.

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

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.

This project leads to an understanding that a whole may be built of smaller parts that fit and work together and provides an introduction to basic tools.

This science fair project idea explores the egg's thin membrane.

This science fair project idea examines whether adding gelatin causes a solid to have a higher melting point and/or melt slower.

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.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

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.

Is it a square or a circle? See if you can trick your friends with this zany science project!

What is a wedge? Kids find out by experimenting with different wedges in this simple 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.