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

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

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

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.

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

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.

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

This easy at-home experiment is a great way to "see" science.

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.

This activity will introduce your child to the four different components of blood and give him a fun way to visualize its properties.

This basketball project explores the best way to make the perfect shot every 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!

In this fun project, use a memory game to test various age groups and determine whether aging directly affects short-term memory loss.

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.

In this cool project, create a lighted, scale model of the different layers of the Sun, including the core, radiation and convection zones, and photosphere.

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

Help your young scientist celebrate the wonders of the night sky in the comfort of your own home.

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

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

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

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

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

Ant behavior is closely related to light intensity. This free science fair project idea examines how fast ants dig when they are exposed to to light and dark.

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.

In this microwave plant experiment, find out whether microwave radiation will affect radish seed germination. Will it help or hinder the plants' growth?

What cause the phases of the moon? Make a model to see how the positions of the Sun, Moon, and Earth cause the crescent, gibbous, quarter, full, and new moon.