This science fair project idea produces varying pitches of sound.

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

Make your own helicopter using a paper clip and a sheet of paper. Hold the spinner up in the air, let it go, and watch it spin gracefully to the ground.

In this science fair project, young children discover what happens when two fluids that have different densities get together.

Your child will do a fun science experiment using soap and pepper flakes to help understand the concepts of water molecules and the surface tension of water.

This 4th of July, explore fourth grade science and make some safe fireworks in your own backyard using soda pop!

This homemade barometer allows your little scientist to contemplate and compare different air and weather conditions.

Engineers in training can get started with this simple wheel-and-axle construction activity.

This homemade parachute toy is incredibly easy to build. Plus, it gives kids an excuse to investigate and experiment...the backbone of kindergarten science.

What is elasticity? Students will investigate how this concept applies to bouncing ball physics by testing the bounces of balls made out of different materials.

Children combine an acid and an alkaline substance to simulate a volcano eruption in this fun experiment.

Water can go from solid to liquid to gas...but how does popcorn go from kernel to snack? Invite your first grade scientist to find out.

This simple "how to make a water wheel" activity makes physics come alive for your child by demonstrating how different kinds of energy work.

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.

This science fair project creates a visual model of whatâs happening to sound waves as a car approaches and then leaves.

Has your kid noticed how much bigger the moon looks when it's low in the sky? Here's an activity you can do to show them that it's just an optical illusion.

This project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

Help your fifth grader execute this experiment involving a lit candle (submerged in water!) to show him the wonders of heat energy transference.

Blanket forts are a kid classic! Let your child create a âfortress of solitudeâ on his own for reading, telling scary stories or for cozy cocooning.

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 science fair project idea explores whether talking to a plant will help it grow.

The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

An home science experiment for older students that teaches about the science behind heat.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

This easy Halloween-themed science experiment for first-graders is perfect for chilly October afternoons or great as a Halloween party activity.

It's easier than you think to make homemade play dough -- just a few pantry staples makes a natural version of the toy that kids have loved for generations.

Try this chemistry experiment with your curious kid and get some "shocking" results!