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Plants and light seem to be good buddies, but how far does the friendship really go?

Use pepper and soap to discover some fun facts about the properties of water.

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.

In this classic Ivory soap experiment, kids learn what happens to different types of soap in the microwave, and why!

Young scientists will investigate people's preferences for saltiness, and make some inferences about genetics and diet.

Discover how to make fake snot with this cool science fair project idea to learn about polymers, enzymes, and more.

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.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

Be a chemist for a day and study the simple reaction between sugar and heat. Try heating sugar and see what happens!

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

Play with balance and simple engineering as you hurry to create a sturdy rock tower.

What's the relationship between temperature, air humidity and static electricity? Kids will find out with this free static electricity science fair project.

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.

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!

Gather some friends for a bubbly soda taste test do determine calories' role in your favorite drinks.

Find out whether soil amendments can improve soil conditions and help you grow a bigger beanstalk in this ecology experiment!

Can you increase the light and plant growth in your garden using mirrors? In this experiment, measure light reflection and find out!

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.

This is a fantastic and easy science experiment where kids will learn about elasticity by testing how high bouncy balls of different materials can bounce.

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

In this project, all you need is a protractor to learn how to use the altitude of Polaris to find latitude on Earth. Polaris is also known as the North Star.

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.

In this science fair project, learn how a mineral streak is made and how it can help identify an unknown mineral.

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.

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

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