Does the temperature of a magnet affect its strength? Learn about the relationship between magnets and temperature with this cool physics science fair project.

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

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

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

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.

The objective of this science fair project is to examine the basic principles of air pressure using simple materials like a balloon, straw and string.

In this exciting design challenge, your child will use design thinking skills to create a mixture that can inflate a balloon.

This science fair project teaches about mold. Students will test different foods to see which grow mold the fastest.

In this simple science project, learn about what causes dew and what affects dew formation with a drinking glass, ice, and a soda bottle.

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.

Check out this cool science fair project idea to explore which other common animals besides scorpions glow under a UV Black light.

This science fair project teaches students the differences between fruits and vegetables.

Give your budding young observers a chance to discover simple machines at use in their own home.

How do you tell time without a watch? Use the sun! This simple activity will show your child how to build his own sundial.

The goal of this project is to create an exciting topographical map out of dough.

This project examines if computer screen and text color affect retention and if people subconsciously prefer combinations of colors that help their retention.

In this design challenge, your child will make a bottle rocket using typical household items.

This science fair project idea investigates how magnetism can defy the force of gravity.

This science fair project creates a visual model of whatâs happening to sound waves as a car approaches and then leaves.

Let your fourth grade chef mix up butter and sugar with scientific principles about different states of matter, and get delicious toffee, too.

To help your child learn how to use a thermometer, try this temperature collecting activity at home.

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

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.

In this hands-on design challenge your child will make their very own Rube Goldberg Machine.