Science fair project that helps you better understand density by comparing the relative densities of cans of Coke and Diet Coke.

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.

This science fair project idea explores how the shape of a boat affects its density and how much weight it can float.

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

Discover which fabrics shrink the most in the wash and why.

If your fourth grader is obsessed with all things glow-in-the-dark, then here's an activity that will really light up her imagination!

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

Do lefties just write different or are their brains different? This science project has students explore what it means to be left handed.

This experiment that explores water and air pressure will amaze your fifth grader as it appears that a single card is holding water in an upside-down glass.

This science fair project idea explores alcoholic fermentation at work by making your own soda.

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

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

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 fair project idea examines whether the colors of the spectrum respond differently in the thermal aspect when radiated by the sun.

Test out the pH levels of soil in your backyard versus soil in more wild environments to solve this science case.

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.

Help your young scientist celebrate the wonders of the night sky in the comfort of your own home.

This science fair project demonstrates the magic of arches by challenging students to stack telephone books on top of eggs without breaking them.

Do you love to make Jell-O? Find out in this science fair project idea if it is possible to make Jell-O with just warm water.

Your fourth grader will be astonished to discover the significance and intricacies of his spine as he builds a model of a human vertebral column.

What is it about a Slinky that causes it to walk down the steps? This simple experiment is a perfect illustration of both gravity and momentum.

In this activity, students will create a stop motion animation by creating a clay figure and taking a series of digital photographs.

Excite your fourth grader by recreating ancient Viking myths. This miniature longboat will explore the principle of water molecules expanding when heated.

Does your middle school teenager have good reflexes? Gauge his reaction time in this science and math activity that requires only a yardstick and a friend.

Let your fabulous crafter use their favorite flowers, fruits and herbs to whip up a delicious perfume that they can proudly present to a friend or a loved one.

How good are humans at sound localization? Kids can try this cool science fair project idea to see how good their friends are at judging sound direction.

This science fair project idea measures out the sugar of various foods and find out whether people can correctly determine how much sugar is in common foods.

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

Science fair project that examines the behavior of water and gravel in creek beds and the formation of sedimentary rocks.

Experiment with buoyancy to learn how a submarine rises and sinks in this classic science experiment.