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!

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.

Your third grader will delight in learning about sound waves as he observes the different sounds created by tapping on glasses with varying amounts of water.

Learn about sound physics and do a survey experiment to explore the difference between sound and noise in this science project.

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.

Come take off your shoes and explore with your feet. Your child will embark on a barefoot adventure as he plays with different textures.

Learn how to be a bird scientist in this simple project of watching feathered friends in their habitat.

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

When you see those sunscreen "protection levels," what does that really mean? Try this experiment to find out.

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.

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.

Here's a great early reading and science activity for curious children. Learn how to plant your child's name in seeds for a growing writing activity!

Let your young scientist explore a brave new world of sound with an experiment that just requires a handful of common household items.

In this classic Ivory soap experiment, kids learn what happens to different types of soap in the microwave, and why!

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.

Check out this silly game that will put your kid's animal habitat knowledge (and acting skills) to the test.

Step into the fantastic world of colors with a project that explores what shade you -- and your friends -- like best.

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.

What causes sound? Here's a simple science experiment that adds a visual element to the science of sound to help kids better understand this tricky concept.

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

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.

In this experiment, your child will create two compost bins and see if he can determine what attracts fruit flies.

This biodiversity project examines the biodiversity in your own backyard.

Stories change as you retell them. The objective of this science fair project is to demonstrate how information gets interpreted, distorted and changed.

With this cool floating rocks project, your child will get some hands-on experience with buoyancy and learn why certain rocks like pumice are able to float.