In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

This science fair project creates a visual model of whatâs happening to sound waves as a car approaches and then leaves.

Young scientists will investigate people's preferences for saltiness, and make some inferences about genetics and diet.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

What's the relationship between temperature, air humidity and static electricity? Kids will find out with this free static electricity science fair project.

Science fair project which evaluates different athletic shoes in order to find out whether any of them affect a person's ability to run.

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.

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.

Most people assume that cold water freezes more quickly, but could that be false? Does hot water freeze faster than cold water? Let's find out!

Have you ever noticed the ridges on a dog's nose? In this project, we take several dogs' nose prints and discover just how unique they are!

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 Bernoulli's Principle experiment, you'll learn how an increase in the speed of a fluid, like air, decreases pressure.

Young physicists will wrestle with a discrepant event: the Hammer Ruler Trick. They'll make some inferences about torque, balance, and center of gravity.

In this experiment, students will discover how heat and pressure turn clay into slate, phyllite, and finally schist.

How does a compass work? What's a magnetic field? Kids will build their own compass at home to find the answers in this great science fair project idea.

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

Saturn is the ringed planet in our solar system, a gas giant with rings made of ice and dust. Let's make a cool scale model with an old CD and some glitter!

Is there a relationship between caffeine and heart rate? Students will determine the effect of caffeine on heart rate in this fun science fair project.

Magnets vary in strength. Have your young scientist figure out which kind of magnet is the strongest when you have him conduct this attractive experiment.

In this science fair project, students make their own rain gauge to measure rainfall.

While your cells are much too small to see without a microscope, you can create the look of a cell in your very own home with just an egg and vinegar!

This science fair project idea explores whether cats can be trained in the same way that dogs can.

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

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.

In this fun experiment, learn about brand awareness and the influence of media on children by testing logo recognition in different age groups.

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.

Kids conduct a cool balloon rocket experiment in this fun science fair project idea. Does a greater volume of air mean a greater distance traveled?

Did you ever add salt to pasta? Did it help cook the pasta faster? If not, find out in this science fair project idea.

In this science fair project, kids start a chemical reaction that will make a balloon inflate itself!

Check out this fun and easy science fair project idea on germination of a seed and learn to identify exterior and interior parts of a bean seed.