This science fair project idea identifies trees using a dichotomous key.

This science fair project compares the allelopathic affects of juglone, a chemical agent produced by the Black Walnut tree, on two plants.

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

Check out this fun science fair project to make a vinegar and baking soda balloon and demonstrate how gas is created as a result of the chemical reaction.

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

The objective of this science fair project idea is to examine light refraction as it passes through liquid crystals.

In this project, waves of vibrations are experimented with using water in glasses.

In this project students experiment with making music using only glasses of water.

Construct and experiment with a periscope using reflected light rays to gather an image.

Science fair project that examines how to grow bacteria in a controlled setting, using simple materials from around the home.

Science fair project in which you will start a fire from scratch without using matches or a lighter.

This science fair project idea explores whether a sundial is as accurate as an atomic clock when telling time.

Science fair project in which you will attempt to throw a ball the greatest horizontal distance possible by using different angles.

In this design challenge, your child will create a parachute for a small toy using typical household items.

Create a DIY Electromagnet! Using a 9v battery to create an electrical field around a nail, students explore electromagnetism in this cool science project idea.

Science fair project in which you will examine how crystals are formed by creating your own crystal using charcoal briquettes, salt, and ammonia.

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

In this design challenge, your child will make a bottle rocket using typical household items.

This science fair project idea determines if family members can recognize one another using only the sense of smell.

Sink or swim? Calculate the density of various fruits and vegetables using water and a kitchen scale.

The objective of this science fair project is to examine the basic principles of air pressure using simple materials like a balloon, straw and string.

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

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

Explore the craters, maria, and highlands on the surface of the Moon! In this fun science project you'll create a 3-D model of the moon using paper mache.

Experiment about connection of senses of taste and smell. Using blindfold and noseplugs, administer blind taste test. Analyze results and organize data.

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

This project determines the age of a tree using a growth factor chart instead of cutting the tree down to count the rings in its base.

In this cool experiment, learn how to find specific gravity of minerals using liquids of different densities to see which substances and items sink and float.