Using a toy race car kids create a visual model of the Doppler Effect.

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

Before you get ready for a delicious scramble or omelet, add a bit of science to your morning routine!

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.

This classic children's game demonstrates how sound travels through air vs. through a solid.

In this science fair project, you'll make a "ghost" appear in a test tube, and learn about what happens when hot water and cold water interact.

How does dishwashing liquid work? Kids discover the chemical mechanism behind cleansing power in this easy science fair project idea.

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

This science fair project idea investigates how the shape of an object affects drag.

The objective of this science fair project is to examine the effects of temperature on salt and water solutions, as they form crystals over time.

Science fair project idea that examines different physical characteristics of a chosen animal. Make educated guesses about evolution based on animal's form.

This project determines what category of person is most likely to be ticklish.

Science fair project that examines condensation and the conditions needed in order for dew to form.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

Learn about this simple machine and make a pulley of your own to use for fun science trials.

Is it possible to trick the forces of nature that make your bubbles round to create a square bubble?

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

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

Do plants get crowded? Have your curious kid investigate how plants respond if they're forced to grow together in a confined space.

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.

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

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

Kids will learn how to show the direction of magnetic field lines and create a permanent model using iron filings in this great science fair project idea.

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.

Study the life cycle of the common blowfly as it relates to forensic investigation. Record the first time you see flies, maggots, and eggs.

In this science fair project, kids observe the expansion of liquids when frozen and determine if some liquids expand more than others in the freezing process.

This science experiment examines the role of fat in food, especially in making bread rise and whipping cream.

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.

Do different types of oil mix or stack? Find out in this science fair project idea!