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.

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

In this activity, young learners will make a balance using a plastic hanger and weigh a variety of small objects using candy corn.

In this physics project, learn about the relationship between light intensity and distance using a laser pointer, flashlight, and graph paper!

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.

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.

Students pit the heat capacity of water against the heat capacity of oil while looking at the effects of dipole rotation in this cool science fair project idea.

Try the classic balloon-on-the-wall trick with your kid and watch static electricity in action.

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.

This experiment that explores water and air pressure will amaze your fifth grader as it appears that a single card is holding water in an upside-down glass.

How powerful is the reaction between baking soda and vinegar? Find out here!

Take to the air with science by experimenting with helicopter seeds right in your own backyard!

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.

Making your own glass cleaner is easy, effective and inexpensive!

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

Science fair project that examines what causes thunder and why a thunderclap sounds so loud. How is lightening related to the creation of sound waves?

This is a quick, easy science fair project that conveys the idea of density to upper elementary students.

Help your child understand the scientific concept of evaporation with this fun outdoor science activity.

What happens when colored beams of light mix? You might be surprised.

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

An hour glass, also known as a sand clock, keeps time. In this activity, your child will make her own sand clock and measure the time it keeps.

Here is a nifty science experiment using Epsom salts to make "frost" appear on a piece of glass.

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

In this fun science fair project idea learn about universal solvents and solutes and find out the solubility of several common liquid substances.

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.