Is it a square or a circle? See if you can trick your friends with this zany science project!

This project will explore whether test subjects, deprived of points of reference, will, in attempting to walk a straight course, walk in circles.

Science fair project which will teach you more about the foods that you eat, and learn which ones are healthier choices.

This science fair project aims to examine the nature of pi and analyze other properties and values related to circles, such as radius, diameter

In this science fair project, learn how to make gears and find out why they transmit torques in predictable ways.

What causes the seasons to change? Kids find out by modeling the earth's tilt using a globe, flashlight and graph paper in 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.

What causes dilated pupils? Young scientists will find out by applying what they already know about changes in pupil size and making models of the pupil.

Check out this cool science fair project idea on spectrum spinners and investigate how certain color combination can produce other colors.

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!

Science fair project that tests the effects of diluted soap on the size of bubbles blown from the solution. Will dilution cause smaller bubbles?

How do icicles form and what do they look like? Do this free science fair project and watch the formation of icicles occur right before your eyes.

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.

Saturn is the ringed planet in our solar system, a gas giant with rings made of ice and dust. Let's make a cool scale model with an old CD and some glitter!

This science fair project idea creates cool new colorful fabric pattern designs and experiments with the mixing of colors.

This science fair project idea experiments with spinning color wheels and optical illusions.

How good are humans at sound localization? Kids can try this cool science fair project idea to see how good their friends are at judging sound direction.

Use applied math to model orbital eccentricity in this cool science fair project for 7th grade.

This science fair project idea recreates the movement of planetary bodies in order to learn why they sometimes appear to move backwards.

Why do ants like sugar? Do ants like artificial sweeteners too? Kids find out with this great inquiry-based science fair project.

This science fair project idea tests the efficacy of both synthetic and natural antibiotics.

Prove that the Earth is not flat. The objective of this science fair project is to measure the angle of the sun and calculate the circumference of the Earth.

Tree rings can tell the age of the tree but also information about the world. This science experiment uses tree stumps to discover new facts.

This experiment will investigate whether reward or punishment is more apt to motivate people.

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.

How do the phases of the Moon and gravity cause spring tides and neap tides? Does the Sun play a role in the tides? Figure it out in this fun science project!

This is a quick, easy science fair project that conveys the idea of density to upper elementary students.

Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

In this science fair project, young children observe, record, and create collections of shapes in their world and increase their powers of observation.