How does a compass work? What's a magnetic field? Kids will build their own compass at home to find the answers in this great science fair project idea.

How does a flashlight work? Kids will make a complete circuit and explore how voltage contributes to brightness with this science fair project idea.

This science fair project idea explores how enzyme inhibitors, active sites, non-competitive enzyme inhibitors, and substrates work.

This science fair project idea investigates emulsifiers that allow oil and vinegar to mix.

Cleaning can be a chore, but not with this sudsy experiment!

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

This science fair project idea investigates how optical distances change the apparent size of an object as seen through a magnifying lens.

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

This science fair project idea investigates the ability of different whitening toothpastes to whiten teeth.

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

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

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

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!

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.

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

Will storing cucumbers and tomatoes in the fridge destroy their unique flavors? Find out in this science fair project idea!

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.

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 explores how length affects the weight a bridge can hold.

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

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

What is topography? Kids find out by learning to make and read a topographic map in this awesome science fair project idea.

Crayons aren't just good for creating colorful masterpieces -- they're also great for science!

In this science fair project, students examine under what conditions individual plants release seeds and how far the seeds are released.

What is persistence of vision? With this hands-on science fair project idea, students will demonstrate this cool and dramatic phenomenon in their own classroom.

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

This science fair project teaches students about wilting and browning of salad greens.

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

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 a bottom keel helps keep a boat from rocking back and forth.