This science fair project idea determines the most effective method of preserving food.

This science fair project idea investigates the difference in reaction times between boys and girls.

This science fair project idea produces varying pitches of sound.

Ever wondered how a plant drinks water? This science project will teach you how and help you create a beautiful floral display!

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!

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.

Discover how to make fake snot with this cool science fair project idea to learn about polymers, enzymes, and more.

examine how passive solar heating works, measure temperature in a parked car on a sunny day. ways to use passive solar heating as an alternative, energy

Science fair project which determines whether the size or the thickness of a piece of paper has an effect on how many times it can be folded in half.

Create a DIY Electromagnet! Using a 9v battery to create an electrical field around a nail, students explore electromagnetism in this cool science project idea.

In this project, a model of a submarine is built to simulate the buoyancy and displacement of water and air.

This science fair project idea teaches to understand and explore the concepts of crystal formation and dissolving substances.

Take a closer look at your furry friend (or the furry friend of a neighbor -- with permission) to discover if communication exists between cats and humans.

In this project, the affect of acid rain is simulated by the acid, vinegar.

Future engineers, unite! Discover how to keep a sandcastleâs bridge from falling into the moat.

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!

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.

Play with balance and simple engineering as you hurry to create a sturdy rock tower.

In this science fair project, students make their own rain gauge to measure rainfall.

The project determines which type of birds prefer which type of birdseed.

Examine whether distilled water, spring water, or regular tap water yield faster plant growth.

In this project, you'll build a model of the earth, complete with all seven continents and four major oceans.

How does frost form? How fast does it form? Do this simple science project using a plastic glass, rock salt and some water to learn about deposition.

This biodiversity project examines the biodiversity in your own backyard.

Start your toy engines -- this is going to be a fast and friction-filled race!

Is it magic? No...it's the amazing, gravity-defying capillary action experiment! Kids will love this dramatic and enlightening science fair project.

Science fair project that examines the behavior of water and gravel in creek beds and the formation of sedimentary rocks.

Science fair project examining barometric pressure, and how it can be used to predict the weather. How does atmospheric pressures relate to weather conditions?

Is cleaning with lemon effective? Get ready to give this science project some elbow grease and find out if acidic lemons can be used as a cleaning agent.

In this experiment, kids will see if pruning tomato plants makes them more fruitful and learn about the factors that contribute to a plant's fruit production.