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With Halloween right around the corner, find a way to use your brain and reward your tummy with a new type of science -- candy science!

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

Find a mathematical relationship between the intensity of a sound wave and distance from the sound source. Use a pedometer and a sound level meter.

Science fair project that determines what percentage of air is made up of oxygen by examining the chemical reaction between oxygen and rust.

While your cells are much too small to see without a microscope, you can create the look of a cell in your very own home with just an egg and vinegar!

In this project, create and examine garden mulch to find out what critters live in the messy, muddy layers just above the soil.

Can you increase the light and plant growth in your garden using mirrors? In this experiment, measure light reflection and find out!

Kids will learn how to clean fish tank the natural way. Add catfish to the tank and see if your water gets cleaner.

Check out this fun science fair project to make a vinegar and baking soda balloon and demonstrate how gas is created as a result of the chemical reaction.

Science fair project that tests how heat affects the chemical reaction between a seltzer tablet and a glass of water.

This science fair project idea provides evidence that air is everywhere and takes up space.

The goal of this science fair project was to examine how different angles of decline affect the tipping point of a vehicle.

This science project examines the effectiveness of various types of laundry detergents on stains trapped on a white handkerchief.

What is a barycenter? Kids learn how gravity and mass influence the orbit of binary systems like planets and moons or stars and planets in this cool experiment.

This science fair project idea studies the acidity of rain water and whether the acidity is the same on all rainy days or does it fluctuate.

Would it hurt to skip brushing your teeth just this once? Let's find out by seeing which foods produce the most mouth bacteria.

What's the difference between a microwave and an oven? Use mashed potatoes to explore which kitchen appliance does a better job at keeping food warm.

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

In this science fair project, students discover how sedimentary layers form as sediments like mud, silt and sand settle over time.

This interactive project invites science fair-goers to participate in examination and recording to demonstrate the importance of firsthand observation.

This science fair project idea determines how your body responds to allergies.

This science fair project idea demonstrates sonar mapping of the ocean floor.

This basketball project explores the best way to make the perfect shot every time.

Make a backbone model to explore human anatomy and life science.

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

This science fair project tested various nose cones to determine which would be the most ideal shape for propelling a water rocket.

The goal of this science fair project is to identify the galactic center of the milky way using globular clusters, as found through Google Earth.

This science fair project idea determines if crystals will absorb food dye and if colors will mix by the process of diffusion.

This science fair project idea focuses on the production of oxygen by plants during the photosynthesis process.