Grow potatoes in a plastic bag—easy to grow and harvest, and yummy to eat!

Use simple items to create a kindergarten "grow box" that lets a kid see just how salad plants send down their roots and grow underground.

Grow borax crystals and get your child excited about Earth science with this crafty science experiment.

Test whether plants can grow without sunlight and water.

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

Science fair project that examines how to grow bacteria in a controlled setting, using simple materials from around the home.

In this science fair project, students learn how pressure can make the minerals in a rock line up in the same direction and form bands and foliation.

How does distance affect the spreading of light? Kids see diffraction and the inverse square law of light in action with this great science fair project idea.

The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

Kids learn how to prevent erosion by growing grass. They'll test soil with grass against raw soil in this revealing science fair project idea for 4th grade.

This science fair project explores how osmotic pressure forces water through the root up into the plant.

Observe corn seed germination to learn about dicots and monocots and how plants grow from seeds to seedlings to full-grown plants!

Learn how to demagnetize a magnet and how physics can explain this phenomenon with this enlightening science fair project.

In this science fair project, learn how to make gears and find out why they transmit torques in predictable ways.

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.

How do the phases of the Moon and gravity cause spring tides and neap tides? Does the Sun play a role in the tides? Figure it out in this fun science project!

This science fair project examines how seeds hitchhike on animals and clothing.

Ever wondered how a plant drinks water? This science project will teach you how and help you create a beautiful floral display!

In this experiment you observe and determine how well your cat uses his whiskers to navigate through a maze.

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

Learn how to make a weathervane with this fun and simple meteorology project for fourth graders.

Create safe lightning for kids! They'll learn how to make lightning at home with this fun science fair project idea illustrating static charges and grounding.

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

This science fair project explains the process of how the lungs expand and contract with the help of the diaphragm.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

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

The objective of this science fair project is to experiment with balancing everyday objects and observing the the effects of gravity on materials.

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

In this science fair project, students discover how sedimentary layers form as sediments like mud, silt and sand settle over time.

Watch pre-packaged seeds and seeds taken from inside fruits and vegetables grow. Which ones will grow faster? Read more in this science fair project idea.