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!

In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

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

What do ants eat? Kids find out by observing a colony of ants in this cool zoology science fair project for 4th grade.

Do you love to make Jell-O? Find out in this science fair project idea if it is possible to make Jell-O with just warm 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.

The purpose of this science fair project is to demonstrate how yeast, a fungus, causes bread to rise.

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

This project explores whether plants can live and grow when "watered" with juice, soda, or milk.

In this project, sunlight is blocked from a leaf in order to see the affect that sunlight has on leaves.

This science fair project idea determines if the size of the parachute will change the rate at which an object falls.

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

Marshmallows are made of sugar, water, and air pockets. Since the marshmallow is flexible, will air pressure cause it to expand when heated in a microwave?

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

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

Do you think heat can affect a plant's growth rate?

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

This science fair project idea explores whether the process used to dry the beans we eat for food renders them unviable.

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.

This science fair project idea investigates how color affects temperature.

This project tests the hypothesis that dark colors absorb more heat than light colors.

This science fair project teaches about mold. Students will test different foods to see which grow mold the fastest.

This science fair project idea explores substances that cause a bubble to last longer.

The purpose of this science fair project is to explore whether UV light passes through some colors and not others by looking at blue, red, purple, and clear.

This science fair project idea investigates if fats add to the flavor of food.

This science fair project idea compares biodiversity between drops of water.

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

The project determines the forces that cause paper airplanes to fly and determine which type of paper airplane flies the farthest.

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

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