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Did you know your body is full of simple machines? This project looks at one of the third-class levers in the human body: your arm!

This science fair project idea investigates how the shape of an object affects drag.

In this activity, students will think about the form and function of household objects as they compare and contrast kitchen serving spoons of various sizes and designs.

Find out whether a longer airplane will fly farther or a wider paper airplane.

When you see those sunscreen "protection levels," what does that really mean? Try this experiment to find out.

In this activity, your child will learn about a style of gardening that uses moss, also called "kokedama."

Air invisible; it doesn't make sounds; you can't pick it up and throw it. So how do we know it exists? Help your second grade scientist figure it out.

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!

In this enlightening transpiration experiment, kids will explore how the loss of water from plants through transpiration contributes to the water cycle.

Milk is made of water and fat; but how can you separate the two? Find out in this color changing milk experiment.

In this science project, learn about water transport in plants and make a beautiful dyed floral arrangement with cohesion, adhesion, and xylem tubes!

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

Create a soda bottle garden that defies gravity! This hanging terrarium is housed in a soda bottle and perfect for crafty kids with a growing green thumb.

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

This science fair project idea explores the egg's thin membrane.

In this fun design challenge, your child will get creative with making structures out of toothpicks and gumdrop candies.

In this project, learn about animal vision and different kinds of eyes: ocelli, compound eyes, and camera eyes. Find out what a jellyfish or grasshopper sees!

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

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

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.

Do you think heat can affect a plant's growth rate?

In this activity your child will create their very own marble maze!

The purpose of this science fair project is to explore whether UV light passes through some colors and not others by looking at blue, red, purple, and clear.

What causes dilated pupils? Young scientists will find out by applying what they already know about changes in pupil size and making models of the pupil.

What is elasticity? Students will investigate how this concept applies to bouncing ball physics by testing the bounces of balls made out of different materials.

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.

In this project, build an insect model that shows how the head, thorax, and abdomen fit together! Learn insect anatomy by constructing a paper mache critter.

This science fair project idea determines what household items are good conductors of electricity.

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

This simple heat transfer experiment is a great introduction to the concepts of heat transfer and conduction.