This project compares the strength of one, two, and three-ply toilet paper.

In this cool science experiment, learn about magnetism and poles, and test magnet strength to find out if two magnets are twice as strong as one.

Observe how your brain works while it is focused on one thing, and how it works while you are distracted by another thing.

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.

Find out whether a longer airplane will fly farther or a wider paper airplane.

What is a compound microscope? Kids find out by making one of their own in this cool science fair project.

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!

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

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

Young scientists will investigate people's preferences for saltiness, and make some inferences about genetics and diet.

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

In this outdoor science activity you'll find tips on how to create a nature journal by choosing a native plant or animal and tracking that species.

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

Plants and light seem to be good buddies, but how far does the friendship really go?

This science fair project idea explores how length affects the weight a bridge can hold.

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 explores whether the process used to dry the beans we eat for food renders them unviable.

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

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.

In this project students experiment with making music using only glasses of water.

In this experiment we will be determining whether birds prefer certain colors of seed.

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

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

This science fair project idea examines whether plants are still able to grow normally if they are turned upside-down.