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

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

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.

In this project children practice the scientific method while playing with puffy paint.

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

Kids will learn some cool stuff about chemical reactions by determining what happens when you mix different concentrations of hydrogen peroxide and yeast.

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

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

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

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

The objective of this science fair project is to observe the differences in heat absorption for darker colors vs. lighter colors.

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

This science experiment tests whether warm or cold water works best in making cut flowers last longer.

Will potatoes spud or sprout faster in dry, dark, or cold conditions? Find out in this science fair project idea!

This project investigates the affect of storage temperature on microwave popcorn.

Gather some friends for a bubbly soda taste test do determine calories' role in your favorite drinks.

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

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 science fair project idea examines which type of insulation holds in the most heat.

This science fair project idea investigates how a bottom keel helps keep a boat from rocking back and forth.

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.

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

There are many benefits to bugs and insects. This science project shows how cockroaches, termites, and other critters benefit our planet.

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.

The goal of this evaporation experiment is to learn about how different external conditions affect drying time.

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

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

This science fair project idea investigates how the height at which a pendulum is released affects the length of time it continues.

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