Prove that the Earth is not flat. The objective of this science fair project is to measure the angle of the sun and calculate the circumference of the Earth.

Turn an abstract lesson into a practical craft with the fun and colorful creation of dough earth layers!

This science fair idea project identifies the active ingredients in soap and experiments with the properties of soap.

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

Your child will learn science and make a fun new malleable toy with this balloon sandbag science experiment.

Learn about lateral earthquake motion and its effect on high rise buildings in this simple 4th grade earth science experiment.

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

Have your kid determine if a goldfish can be conditioned to expect food the same way Pavlov's dogs did with this fascinating science fair project.

How greasy are your potato chips? Students will use a reliable method to quantify greasiness and compare different brands in this great science fair project.

Wondering how we know that air is there? Here's a quick and easy experiment that proves that air may be thin, but it's not too wimpy to block your shot!

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.

Let your fourth grade chef mix up butter and sugar with scientific principles about different states of matter, and get delicious toffee, too.

Try this chemistry experiment with your curious kid and get some "shocking" results!

How would you dry your wet clothes if your dryer didn't work? Find out with this fun experiment!

Tree rings can tell the age of the tree but also information about the world. This science experiment uses tree stumps to discover new facts.

An home science experiment for older students that teaches about the science behind heat.

Check out this cool science project idea to learn about rocks and explore the cycles of formation, breakdown, and reformation of rocks in the Earth's crust.

This science fair project idea investigates how magnetism can defy the force of gravity.

In this project, all you need is a protractor to learn how to use the altitude of Polaris to find latitude on Earth. Polaris is also known as the North Star.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

How do organic materials become soil? This science experiment measures what materials biodegrade.

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.

This science fair project idea examines liquids of different densities.

This science fair project idea researches the effects of acid rain on plant growth.

This science fair project idea researches the different layers of the atmosphere and creates a visual representation of the atmospheric layers.

This science project teaches students to classify different shapes of leaves.

This science fair project teaches students the differences between fruits and vegetables.

This science fair project idea compares biodiversity between drops of water.

This science project idea examines the effect of microwaving on various objects.

This science fair project idea investigates how color affects temperature.