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

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

This classic children's game demonstrates how sound travels through air vs. through a solid.

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

This project examines Newton's First and Second Laws of Motion with a bicycle and water balloons.

This experiment will determine how different kinds of light affects the strength of bakerâs yeast.

Science fair project the demonstrates Newton's Third Law using a milk carton filled with water.

This science fair project studies which color(s) of flowers butterflies & bees are attracted to and if color plays a role in flower selection for pollination.

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.

Water, along with soil and light, is a necessary component for plant growth. So what's better for promoting plant growth: tap water, or rain water?

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!

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!

Kids learn about the color rendering index by finding the best lightning for makeup in this fun and original physics science fair project idea.

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 project students learn about the golden ratio and investigate if it can be used to predict people's assessment of beauty in others.

How can Hooke's law explain how springs work? Learn about how Hooke's law is at work when you exert force on a spring in this cool science project.

This science fair project determines which type of physical activity most improves memory.

In this science fair project, we'll use a liquid crystal thermometer to find out whether exercising makes a difference in people's temperature.

Learn about magnifying glasses, concave lenses and inverted images by sending rays of light through a magnifying glass in this cool science fair project!

This science fair project idea investigates the relationship between memory and age.