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!

Make a backbone model to explore human anatomy and life science.

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.

Design a survival kit. Brainstorm various survival scenarios. Address basic human requirements and natural resources. Describe each tool as well uses.

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

In this experiment you explore how tectonic plates move to create land and expand bodies of water.

This science fair project idea explores whether talking to a plant will help it grow.

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 sensitive is your skin? Here's a fourth grade science experiment that lets your child figure it out.

Science fair project idea that examines different physical characteristics of a chosen animal. Make educated guesses about evolution based on animal's form.

Get this cool science fair idea to explore how arctic tundra animals change their behavior and adapt to survive in long, cold winters.

Help your child create a working lung model that fills with air just like the lungs inside of his own chest when he breathes.

This kinesthetic learning activity will help your fourth grader get a firm grasp on the immensity of the solar system.

Recreate the fantastic phenomena of solar eclipses with your child using just a flashlight, a quarter, and her very own face!

What happens when eyes see something that the brain knows cannot be true? In this science activity, the brain has to "fudge" it when interpreting what you see.

Kids will learn about the interaction of lactose and lactase in milk and discover why we describe enzymes as catalysts in this fun science fair project.

This science fair project idea determines which method of hand cleansing is the most effective.

Your child can help your family pet take a breather, and help herself relax, too, with this soothing activity.

Teach your creative second grader about proportions, animals, and proper cutting methods with cucumber carving.

Build a 3d animal cell model with this cool science fair project, which helps kids visualize and understand the function of a cell's parts and organelles.

This science fair project idea explores whether white light can be separated into different colors.

Help your child learn about animal classification with this fun and delicious activity.

This science fair project idea experiments with spinning color wheels and optical illusions.

Encourage a group of third graders to play this fun game of Whistle Hide-and-Seek as a warm-up to get them prepared for finding a "lost" camper.

Can you increase the light and plant growth in your garden using mirrors? In this experiment, measure light reflection and find out!

Stir up some enthusiasm for experimentation with this candy-cracking science experiment!

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

Show your fourth grader how to see her heart in action. Make a simple device out of a drinking straw and clay to help her spot the movement of her pulse!

This science fair project idea explores if the length of the string that an object is suspended on has an effect on how fast or slow it swings.

What do ants eat? Kids find out by observing a colony of ants in this cool zoology science fair project for 4th grade.