Find out the differences (if any) in the frequencies of voices produced from a computer, from a phone, and directly coming out of the voice box of a human.

Here's an investigative activity in which your child will discover real-world names and uses for sugar and find out how it is hidden in many different foods.

This science fair project demonstrates the principles of reflection through simple experiments involving mirrors and light.

Show your child how and why the microwave works, while demonstrating just how strangely foods can behave while inside the crazy cooker.

What do you get when you combine science and fairies? Fairy scientists who make their own potion, of course! This activity promotes critical thinking skills as your child mixes, experiments, and creates their very own fairy potions.

This science fair project idea studies how talking on a cell phone affect driving?

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.

Find a mathematical relationship between the intensity of a sound wave and distance from the sound source. Use a pedometer and a sound level meter.

Help your child get a grasp on what it was like to build gigantic ancient structures with this easy engineering activity about science and physics.

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.

This project determines what percentage of test subjects react adversely to the sound of fingernails on a chalkboard and explores their physiological responses.

The purpose of this science fair project is to build a basic radio.

This activity will help your child review science concepts, learn new ones, and become familiar with examples of various concepts in science. Plus, it's fun!

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.

Discover whether different amounts of water added into a wine glass will produce a different pitch when their fingers are rubbed along the rim.

The objective of this experiment is to identify common materials that absorb sound waves with the greatest efficiency.

The goal of this science fair project is to assess the acidity levels of common food and household products using pH test strips.

Look for a correlation between temperature and the intensity of cricket chirping. Measure ambient temperature and sound intensity in decibels.

Is it solid or liquid? Create oobleck and witness the amazingly weird oscillation between the two!

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

This science fair project idea produces sounds by creating vibrations using different objects.

This science fair project idea shows how a vibrating object transfers energy to whatever it touches.

Help your first grader explore the world of scientific measurement by "weighing" fruit with a "water scale"!

This science project examines the history of earthquakes and what we can do to prevent future disasters.

Have your kid build an ice sculpture in this activity that's so fast, fun, and messy it's the perfect way to demonstrate how much fun experiments can be!

This science fair project idea demonstrates sonar mapping of the ocean floor.

This experiment will explore how mallets of various materials and weight create sonic tones of varying lengths.

Future whistleblowers can learn about product safety standards with this exercise in writing and researching.

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

First grade science often covers solids, liquids, and gases. This silly science explores serious facts about the difference between all three.