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

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.

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!

Your child can create his own texture tree, experimenting with design during the process. The result will be a beautiful addition to your holiday decorations

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.

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 is a quick, easy science fair project that conveys the idea of density to preschool and early elementary children.

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.

What is persistence of vision? With this hands-on science fair project idea, students will demonstrate this cool and dramatic phenomenon in their own classroom.

How does a compass work? What's a magnetic field? Kids will build their own compass at home to find the answers in this great science fair project idea.

The goal of this fun science fair project idea is to microwave candy and investigate: do some colors of M&Ms melt faster than others?

In this simple circular motion experiment, you'll observe tangential velocity and learn about how acceleration and centripetal force affect an object.

This simple heat transfer experiment is a great introduction to the concepts of heat transfer and conduction.

Have you ever noticed the way a dropped stone makes a fun pattern in a pond or lake? What's the science behind these splashy occurrences?

Kids often ask, "how tall am I?" This science fair project seeks to determine how well kids can guess their own heights.

Are you ready to be a detective for science? Then get out your magnifying glass and start studying fingerprints!

Learn about the role of Earth's rotation on the Coriolis Effect and hurricanes in this science project. Model the Coriolis Effect on a hurricane's direction.

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

Check out this fun science fair project idea for 1st grade: a solar eclipse model that demonstrates total, partial, and annular solar eclipses.