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This science fair project on testing water hardness is a great introduction to practical chemistry. Test and learn the difference between hard and soft water.

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

Science fair project which determines whether plants are able to get enough nutrients from different types of garbage.

In this science fair project, we learn how air molecules move as a result of density, convection, and air currents.

This science experiment tests if dog saliva can really help heal wounds.

In this activity your child will create their very own marble maze!

Demonstrate how to tell the age of an egg without having to crack it open.

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

This project uses science and art to help students learn and teach others about Earth's endangered and extinct species.

The goal of this science fair experiment is to demonstrate the effects of air pressure on objects and analyze applications of air pressure principles.

Does electricity move better through thick wires or thin ones? kids will conduct this classic electricity experiment for this science fair project.

In this science experiment, observe convection currents forming and learn about how heat energy moves in liquids from hot to cooler areas through convection.

Kids will learn how to make a steam powered rocket boat, also called a putt putt boat or a pop pop boat, in this great science fair project for 4th graders.

This science project uses Mohsâ Hardness Test to show kids how to compare the hardness of different types of minerals.

Throughout history, people have used song as a teaching and memory tool. This project explores whether song improves a person's ability to retain information.

In this science fair project, learn how to make gears and find out why they transmit torques in predictable ways.

Discover whether cold or hot water from the faucet will boil faster on the stove.

This science fair project idea produces varying pitches of sound.

Kids will learn about insulation, heat conduction, and the economic benefits of energy efficient windows in this cool science fair project.

Students explore hot desert plant adaptations in this cool science fair project by observing how these organisms prevent excessive transpiration.

This science fair project idea explores whether cats can be trained in the same way that dogs can.

This experiment has students record rat behavior to learn about the benefits of rats and research rat myths throughout history.

Have you ever noticed the ridges on a dog's nose? In this project, we take several dogs' nose prints and discover just how unique they are!

Demonstrate how you can make your own compass using a magnetized needle. It also allows you to compare magnetic north and geographic north.

This science fair project idea determines which method of hand cleansing is the most effective.

In this open-ended activity, students will be given a small quantity of three types of materials and asked to design a prototype for “something that will improve the school.”

This science fair project idea explores whether color affects a person's emotional state.

Dive into the world of cooking oil and smoke points to discover just how fast some oils start smoking.