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.

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

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

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.

This science fair project idea produces varying pitches of sound.

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

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

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

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

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

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

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

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under 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 fun science fair project idea learn about universal solvents and solutes and find out the solubility of several common liquid substances.

Kids will conduct a cool limewater carbon dioxide test that can be performed with common household materials to learn about the chemistry of this common gas.

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

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