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

In this science fair project, kids measure how weather conditions affect how fast a puddle evaporates.

Kids often ask, "how tall am I?" This science fair project seeks to determine how well kids can guess their own heights.

Science fair project that demonstrates the different phases of the moon by physically representing them with construction paper and a shoebox

Learn how to make a periscope with this cool engineering science fair project idea, and learn about optics to learn how a periscope works.

How do crystals form? In this science fair project, students will use three different saturated solutions to see how different minerals form crystals over time.

How does frost form? How fast does it form? Do this simple science project using a plastic glass, rock salt and some water to learn about deposition.

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.

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

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

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

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

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

This science fair project idea investigates how different disinfectants work in killing germs.

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

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.

This science fair project idea explores how water and ice can change the form of rocks.

A math project teaches students to use a clinometer to gauge the height of very tall objects like trees & to think of better ways to measure how high they are.

How does smell affect taste? Ready your taste buds--in this project, you'll gather some test subjects and do a taste test to see how much smell affects taste.

How does mold grow? Kids find out by testing different conditions to measure mold growth rate and learn about what factors cause mold to grow more quickly.

This science fair project idea shows kids how to grow mold and whether mold grows better in dry or moist conditions.

Science fair project that examines the relationship between the size of a bubble and how quickly it falls. What is the correlation?

This project explores how and how much one family can reduce the amount of garbage they accumulate over a three month period.

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

Learn how to tell time by the sun with this cool science fair project idea that tracks how the accuracy of a sundial changes over time.

This science fair project idea explores how far the average human can see.

How does a flashlight work? Kids will make a complete circuit and explore how voltage contributes to brightness with this science fair project idea.

In this science experiment, your child will test the strength of hollow structures in order to understand how strong bird bones really are.

Want to get your bookworm interested in science? Check out this cool activity that teaches kids how to write science fiction!

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.