In this science and engineering activity, children will explore types of tunnels and their purposes and then design and build a tunnel of their own.

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

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

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

Science fair project that determines whether lettuce that is harvested gradually yields more produce than lettuce that is harvested all at once.

Children combine an acid and an alkaline substance to simulate a volcano eruption in this fun experiment.

Check out this fun science fair project to make a vinegar and baking soda balloon and demonstrate how gas is created as a result of the chemical reaction.

This science fair project idea provides evidence that air is everywhere and takes up space.

Introduce your child to the world of motion and physics with a bit of marble play inspired by Sir Isaac Newton!

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

Would it hurt to skip brushing your teeth just this once? Let's find out by seeing which foods produce the most mouth bacteria.

What's the difference between a microwave and an oven? Use mashed potatoes to explore which kitchen appliance does a better job at keeping food warm.

There are many benefits to bugs and insects. This science project shows how cockroaches, termites, and other critters benefit our planet.

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

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

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!

Have your child kick off their summer vacation by making a miniature water slide!

What causes the seasons to change? Kids find out by modeling the earth's tilt using a globe, flashlight and graph paper in this cool science fair project idea.

Observe how your brain works while it is focused on one thing, and how it works while you are distracted by another thing.

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

Your child helps the environment while saving your family money in this fun and rewarding "Gas Guzzlers" competition.

Determine whether butterflies like to drink sugar water, salt water, or plain water.

Teach your child how butter is created by shaking up cream the old-fashioned way.

In this activity, students will create a stop motion animation by creating a clay figure and taking a series of digital photographs.

Take a dive into the candy jar with this yummy science experiment.

This taste buds science experiment demonstrates how strongly our sense of smell controls what we taste.

The goal of this science fair project is to discover the science behind carbonated soft drinks and apply this knowledge to create a new one.

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

Science fair project that examines condensation and the conditions needed in order for dew to form.

Science fair project that examines the different types of precipitation, evaluates the density of snow and calculates the ratio of snow-to-liquid.