Examine the effect of pressure on carbonation in soda.

In this experiment, students find out what happens when a less-dense fluid interacts with a denser one, replicating the effect of cooler solid rock on magma.

In this science fair project, apply the principles of leverage and force by building six simple machines designed to set weights in motion.

Do you have your isopods straight? Learn about sow bug and pill bug behavior by building a terrarium to study them in!

This project compares the strength of one, two, and three-ply toilet paper.

What is a compound microscope? Kids find out by making one of their own in this cool science fair project.

This science fair project looks one of the most important factors affecting seed germination: water. A fun and easy plant biology experiment for 3rd graders.

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

Science fair project which tests various sedimentary, igneous and metamorphic rocks to find out whether one rock family is stronger than the others.

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

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.

Kids learn about potential energy, and mechanical energy, and how to make power from water with one of our favorite renewable energy projects for kids.

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!

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

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

Kids explore how a single movable pulley can confer a mechanical advantage over a fixed pulley in this cool engineering science fair project for 2nd grade.

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

What heats up fasterâwater or soil? 5th grade students test the specific heat of water against the specific heat of sand in this great science fair project.

Kids learn how to prevent erosion by growing grass. They'll test soil with grass against raw soil in this revealing science fair project idea for 4th grade.

Does electricity move better through thick wires or thin ones? kids will conduct this classic electricity experiment for this science fair project.

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

Science fair project which will teach you more about the foods that you eat, and learn which ones are healthier choices.

Watch pre-packaged seeds and seeds taken from inside fruits and vegetables grow. Which ones will grow faster? Read more in this science fair project idea.

4th graders construct an ocean food web to learn about consumers and trophic levels, food webs, and food chains in this cool ecology science fair project.

This science fair project idea develops an understanding through experimentation of which shapes are the most structurally strong.

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.

Learn the basic structure of a DNA strand, which is the double helix, how genes form together, and the resemblance DNA has to a twisted ladder. Create a model.

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

Kids will learn how to make a steam powered rocket boat, also called a putt putt boat or a pop pop boat, in this great science fair project for 4th graders.

This science fair project demonstrates the magic of arches by challenging students to stack telephone books on top of eggs without breaking them.