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Crystals are a very special structure. In this third grade activity, your child will learn how to grow salt crystals.

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

The purpose of this science project is to determine which stimulus, gravity or water, will cause the greatest growth response in a plant.

Can a horse lead itself to the carrot? Train your horse with carrots and boxes and test horse memory in this fun zoology science fair project.

Create an organic plastic product using vinegar and cream. Track decomposition over course of several weeks. Compare decomposition with traditional plastics.

This science fair project idea shows kids how to grow mold and whether mold grows better in dry or moist conditions.

Have your child make a special mobile inspired by the weather outside. Learn about seasons, the environment, and art in 3D.

Discover whether cheap saline solution bottle cleans and disinfects just as well as more expensive kinds formulated with different ingredients.

Teach kids about a fun way they can remember this more efficiently- the power of mnemonics. Kids will be amazed.

Illustrate the idea of light refraction with this exciting and mystifying experiment.

Future engineers, unite! Discover how to keep a sandcastleâs bridge from falling into the moat.

Take a closer look at your furry friend (or the furry friend of a neighbor -- with permission) to discover if communication exists between cats and humans.

Help your child create a working lung model that fills with air just like the lungs inside of his own chest when he breathes.

Step into the fantastic world of colors with a project that explores what shade you -- and your friends -- like best.

While your cells are much too small to see without a microscope, you can create the look of a cell in your very own home with just an egg and vinegar!

Soil is made up of different layers. How far down do you need to dig to find the soil horizon, or the place where bits of leaves and branches become soil?

Kids will learn how to clean fish tank the natural way. Add catfish to the tank and see if your water gets cleaner.

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

In this science project, learn about water transport in plants and make a beautiful dyed floral arrangement with cohesion, adhesion, and xylem tubes!

These flying potato poppers make a cool sound, create a celebratory mood, and they can teach your child about the power of air pressure.

In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

What's the chemistry behind dyeing Easter eggs? Will adding vinegar to dye help the eggshell absorb the color? This colorful science project has the answers!

In this fun science fair project idea, kids will experiment with various methods in order to discover the fastest way to cool a soda.

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 light bulb science project includes step-by-step instructions for testing the heat from different light bulbs.

Determine the maximum distance traveled by projectiles launched at an angle. Use some cool math to figure out at which angle your projectile will go farthest.

Here's a math, science, and social studies activity: help your kindergartener become a "coin archaeologist" by examining how different coins look and feel.

Alive or not? This yeast experiment you can conduct with your little scientist explores the answer to this timeless question.

This science fair project idea explores if an LED light can be powered by vegetables and/or fruits.

Check out this cool science fair project idea to explore non-chemical means of preserving fruits by using thermotherapy.