Is it solid or liquid? Create oobleck and witness the amazingly weird oscillation between the two!

Science fair project that examines the different types of precipitation, evaluates the density of snow and calculates the ratio of snow-to-liquid.

How does dishwashing liquid work? Kids discover the chemical mechanism behind cleansing power in this easy science fair project idea.

Get your hands on a concoction that breaks the rules about what's a solid and what's a liquid.

Kids will learn how to make a thermometer to to explore liquid density in this great science fair project. Which liquids are affected by temperature the most?

Put your second grade scientist to work this Fourth of July with our colorful "liquid fireworks" project!

In this science fair project, we'll use a liquid crystal thermometer to find out whether exercising makes a difference in people's temperature.

What's a liquid? What's a solid? What better way to experiment than by turning a childhood favorite, ice cream, into a homemade science lesson!

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

In this science fair project, kids observe the expansion of liquids when frozen and determine if some liquids expand more than others in the freezing process.

Kids will make a beautiful rainbow in a jar and learn what enables different types of liquids to remain distinct in separate layers.

Try this experiment to give your curious kid a more "solid" understanding of how temperature affects the states of matter.

This science fair project idea investigates which objects float and sink in honey, water, and oil.

Before your treat your child (and yourself!) to a yummy snack, help her learn a little about Sir Isaac Newton's First Law of Motion!

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

Do different types of oil mix or stack? Find out in this science fair project idea!

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

In this project children practice the scientific method while playing with puffy paint.

Why doesn't the ocean freeze? Students answer this question by simulating the chemical composition and temperature of arctic waters in their own home.

Help your child experiment with the combination of acid and baking soda by making these homemade bath bombs!

Is it possible to trick the forces of nature that make your bubbles round to create a square bubble?

Magic, science, or household cleanser? Let your second grader decide with this practical, nontoxic chemistry experiment with acids and bases.

In this activity, your child will transform an egg into a glowing, bouncy "ball" that they can play with.

The rock cycle will come alive for your child when he uses broken crayons to create the three basic rock types.

This project explores whether plants can live and grow when "watered" with juice, soda, or milk.

This is a quick, easy science fair project that conveys the idea of density to preschool and early elementary children.

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

The next time you've got a restless second grade earth scientist on your hands, use this experiment to demonstrate crystals and make a tasty treat, too!

This science project teaches young students about germs, bacteria, and the importance of washing their hands. Students will test what is the best way to wash.

Teach your child how butter is created by shaking up cream the old-fashioned way.