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Children will learn why and how to compost as they help with the process of filling their compost, turning it, and observing the changes that occur.

What is topography? Kids find out by learning to make and read a topographic map in this awesome science fair project idea.

Your third grader will delight in learning about sound waves as he observes the different sounds created by tapping on glasses with varying amounts of water.

What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.

Learning about how plants grow is a building block in the early grades science curriculum. Put a fun twist on this life science concept with these cup monster friends!

In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

Introduce your child to the world of motion and physics with a bit of marble play inspired by Sir Isaac Newton!

Create a mini plant habitat with your kid to help teach him what it takes to make an ecosystem work.

Did you ever add salt to pasta? Did it help cook the pasta faster? If not, find out in this science fair project idea.

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

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

This project determines whether Styrofoam, paper, or plastic cups are best for preventing ice from melting.

This science fair project looks one of the most important factors affecting seed germination: water. A fun and easy plant biology experiment for 3rd graders.

Got a birdwatcher on your hands? Bring the birds to your backyard by making a zany bird feeder using an orange and some string.

Most people assume that cold water freezes more quickly, but could that be false? Does hot water freeze faster than cold water? Let's find out!

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!

This activity works well with a group or just with a parent and child, and it can make a great party game since it's both fun and inexpensive.

In this activity, young learners will make a balance using a plastic hanger and weigh a variety of small objects using candy corn.

Before you get ready for a delicious scramble or omelet, add a bit of science to your morning routine!

Kids will learn some cool stuff about chemical reactions by determining what happens when you mix different concentrations of hydrogen peroxide and yeast.

This weather spinner will improve observation skills by encouraging children to examine and track weather details and patterns.

Certain fruits can change gelatinâs ability to set. In this experiment, kids will discover what happens when gelatin meets pineapple enzyme.

The goal of this golf science fair science fair project is to determine whether the temperature of a golf ball affects its elasticity and its rebound.

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

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.

Here is a hands-on activity to help third graders understand the four points of a compass...and how we use them to get around.

Here's a fun science experiment that's refreshingly tasty too! Turn regular water into a tasty treat perfect for consuming on a hot day.

Study the life cycle of the common blowfly as it relates to forensic investigation. Record the first time you see flies, maggots, and eggs.

This balloon-powered car project is a great way for your kid to learn about energy and how it can be used efficiently.

This trick uses vertical and horizontal forces to help your child to push apart your hands apart, no matter how hard you try to keep them together!