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Kids will create their own version of Richard Feynman's rubber band heat engine to learn about thermodynamics with this cool science fair project idea.

Demonstrate how you can make your own compass using a magnetized needle. It also allows you to compare magnetic north and geographic north.

This science fair project idea explores how length affects the weight a bridge can hold.

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

This science fair project idea highlights decomposition rates by comparing how long it takes an item to decompose in a compost pile vs. a landfill.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

This science fair project examines how seeds hitchhike on animals and clothing.

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

The purpose of this science fair project is to determine which conditions and materials quicken the composting process to make the best compost.

How does distance affect the spreading of light? Kids see diffraction and the inverse square law of light in action with this great science fair project idea.

Kids will learn how to measure the viscosity of liquids by making their own homemade viscometer in this great science fair project idea.

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

Kids will make predictions about cricket behavior by conducting this fun and easy experiment which simulates different environments for crickets.

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

Science fair project which compares the rate of temperature change and the maximum temperature as a result of the angle of light radiation.

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

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

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

Be a chemist for a day and study the simple reaction between sugar and heat. Try heating sugar and see what happens!

Construct and experiment with a periscope using reflected light rays to gather an image.

Does electricity move better through thick wires or thin ones? kids will conduct this classic electricity experiment for this science fair project.

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!

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

Science fair project that determines whether landscaping fabric impacts the ability of plants to receive water.

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

Learn about magnifying glasses, concave lenses and inverted images by sending rays of light through a magnifying glass in this cool science fair project!

This science fair project creates a visual model of whatâs happening to sound waves as a car approaches and then leaves.

Check out this cool science project idea to learn about rocks and explore the cycles of formation, breakdown, and reformation of rocks in the Earth's crust.

In this plastic wrap science fair project, you'll learn about polymer permeability and find out which plastic wrap keeps food from dehydrating best.

What heats up fasterâwater or soil? 5th grade students test the specific heat of water against the specific heat of sand in this great science fair project.