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In this cool science experiment, learn about magnetism and poles, and test magnet strength to find out if two magnets are twice as strong as one.

In this science fair project, students learn how pressure can make the minerals in a rock line up in the same direction and form bands and foliation.

This project compares the strength of one, two, and three-ply toilet paper.

This science project lets students explore the number of spots on a ladybird and how to treat ladybugs with respect.

What is a compound microscope? Kids find out by making one of their own in this cool science fair project.

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

Observe how your brain works while it is focused on one thing, and how it works while you are distracted by another thing.

You don't need to wait for rain to see a rainbow. Make one yourself, and teach your child about light and weather in the process.

Show your kids the power of baking powder by conducting a simple experiment. Make four batches of cornbread, all identical except for one thing: baking powder!

This science fair project looks one of the most important factors affecting seed germination: water. A fun and easy plant biology experiment for 3rd graders.

Did you know your body is full of simple machines? This project looks at one of the third-class levers in the human body: your arm!

Looking for an enjoyable evening activity you can do with your kids? Study the stars: help them learn about constellations by making one of their own.

Wool can absorb 1/3 of its weight in water, while still keeping the body warm. She can test this theory by performing a scientific sock comparison!

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

This science fair project idea investigates how a bottom keel helps keep a boat from rocking back and forth.

Have you ever wondered how many numbers most people can memorize? Test your friends to find out!

In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.

Slip some science into storm watching with a homemade rain gauge!

This science experiment has students test whether a snail moves faster on concrete or dirt.

This science fair project idea investigates how the shape of an object affects drag.

This interdisciplinary card game will have your third grader working on math facts as he travels through the solar system!

This science project uses Mohsâ Hardness Test to show kids how to compare the hardness of different types of minerals.

Here's a fun math and science activity: help your child explore four different kinds of measurement, using their hand and a few simple household tools.

Start your toy engines -- this is going to be a fast and friction-filled race!

This science fair project idea explores how the shape of a boat affects its density and how much weight it can float.

This easy aerodynamics activity is a simple way to introduce kids to the scientific method.

Discover flight initiation distance as you play around in the park with this fun bird watching project!

Before Twitter, birds were the ones tweeting, not humans. Have your child discover the magical sounds of nature while recording birds around his neighborhood!

Create a soda bottle garden that defies gravity! This hanging terrarium is housed in a soda bottle and perfect for crafty kids with a growing green thumb.

Here is a hands-on activity to help third graders understand the four points of a compass...and how we use them to get around.