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

Science fair project that examines how cell membranes allow the inward and outward flow of materials as demonstrated by eggs.

In this project, all you need is a protractor to learn how to use the altitude of Polaris to find latitude on Earth. Polaris is also known as the North Star.

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!

Determine whether carpet placed on a lawn will kill grass and weeds. Choose an area of lawn that you would like to remove, record grass that is dead or dying.

Put your young paleontologist's puzzle-solving skills to the test by having her hunt for dinosaur bones and then assemble them to create dinosaur skeletons.

Little scientists will make inferences about hearing loss, pitch, and frequency in this great science fair idea that puts the human ear to the test.

In this hands-on design challenge your child will make their very own Rube Goldberg Machine.

Get a cool science project idea on a photovoltaic cell and explore the various factors that affect the energy output of the photovoltaic cell.

Check out this fun science fair project idea to measure bacterial colonies from door handles and explore the effectiveness of different cleaning agents.

Science fair project about work and energy which uses a simple mathematical formula to predict how far a jar will roll down an incline.

In this cool project, create a lighted, scale model of the different layers of the Sun, including the core, radiation and convection zones, and photosphere.

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.

Test out the pH levels of soil in your backyard versus soil in more wild environments to solve this science case.

Kids conduct a cool balloon rocket experiment in this fun science fair project idea. Does a greater volume of air mean a greater distance traveled?

Brine shrimp usually live in saltwater. Investigate how salt concentration (salinity) affects the rate at which brine shrimp eggs hatch.

Look for correlation between pH values of commercial soaps and detergents and manufacturer claims about eye irritation hazards.

Science fair project that tests the effects of temperature change on the reactivity of the catalase enzyme.

This science project challenges students to learn about and classify weeds and discover new practical uses for weeds.

Find out whether optical mice are useful on all surfaces or if there are drawbacks to this supposedly superior solution to the traditional roller-ball mouse.

Find out whether putting something on top of a plant will inhibit its growth.

Science fair project that guides you through how to test the humidity in the environment using a homemade psychrometer.

This project examines how temperature affects the volume of gas in balloons.

Show your child how to concoct a simple duo of household ingredients that changes color as acids and bases are added!

In this activity, your kid will watch coal turn into crystals right before her very eyes, and learn some science along the way!

This science project teaches students to classify different shapes of leaves.

Evaluate the efficacy of different pain management techniques.

This fun activity makes use of pasta shells, paint, and glue make a crab while your child learns about this unique creature.

In this experiment, recycled objects are separated to demonstrate how mixtures are made and the variance in the physical properties of their ingredients.