This classic children's game demonstrates how sound travels through air vs. through a solid.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.

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

How does the size of a vibrating surface affect the pitch of a drum? Learn about drum size and pitch with this easy science fair project idea.

Air invisible; it doesn't make sounds; you can't pick it up and throw it. So how do we know it exists? Help your second grade scientist figure it out.

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

Take a closer look at your furry friend (or the furry friend of a neighbor -- with permission) to discover if communication exists between cats and humans.

Can you dig it? This science experiment isn't for kids who like to keep their hands clean.

Try this fun and simple activity to help nurture your child's observation skills and nourish a growing love of science!

It's rhyme time! With this science fair project idea, your child will find out which words can be considered easy rhyming words, and why.

Allow your first grader to get his artwork outdoors this summer by letting him create a garden art box for his arts and crafts supplies.

Want to spark your third grader's interest in gardening? Help him make popsicle stick fairies to decorate an enchanting garden oasis.

If you're looking for something to keep your kid busy on a warm day, and give him some writing practice in the process, bring on the mud!

Children will learn all about cause and effect as they experiment with potion-making in this Halloween themed activity.

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

Your 1st grade scientist will improve her observation skills as she's encouraged to eat healthy by comparing the dry and fresh fruit in this experiment.

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

Enjoy those warm spring and summer nights with your child while teaching some basic astronomy at the same time.

Kids will learn how to show the direction of magnetic field lines and create a permanent model using iron filings in this great science fair project idea.

Do earthworms like moisture or darkness? Find out as we explore the relationship between earthworms and light.

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.