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

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

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

This science fair project idea produces varying pitches of sound.

This science fair project idea experiments with spinning color wheels and optical illusions.

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

In this science fair project, kids start a chemical reaction that will make a balloon inflate itself!

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

This science fair project idea investigates which objects float and sink in honey, water, and oil.

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

Help your child experiment with the combination of acid and baking soda by making these homemade bath bombs!

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

This science fair project idea explores the relationship between oil and water in terms of density as well as hydrophilic/hydrophobic compounds.

Help your child understand surface tension by showing them how they can create a "skin" on top of water.

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

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

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.

Have your child build his own mini waterfall, and help him develop his planning, problem solving, and architectural skills.

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.

Help your child explore chromatography, which is the process of separating colors or pigments, and create a neat art project in the process!