Using a toy race car kids create a visual model of the Doppler Effect.

Design and build an invention inspired by Rube Goldberg's designs. Build your invention. Test the machine, write a detailed report.

Is there any correlation between hot tubs and high blood pressure? Kids discover the answer (and its biological basis) in this cool science fair project.

Children have a naturally inquisitive mind. Foster their curiosity with a walk through an autumn field or park to answer age-old “why” questions. As you walk with your child, you can encourage them to ask questions.

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 awesome science fair project idea, kids will be attempting to pick up different objects using snail slime.

This science fair project idea determines what factors influence an individual's reaction time using a web-based timed reaction test.

Why doesn't the ocean freeze? Students answer this question by simulating the chemical composition and temperature of arctic waters in their own home.

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

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

The objective of this project is to evaluate whether a top will spin at different rates during different phases of the moon.

Check out this free high school science fair project to explore the physics of the Coriolis effect with a homemade Foucault Pendulum.

Learn about the greenhouse effect- and get great science fair experiment ideas. Read more.

This optics-based science fair project idea teaches kids about real and virtual images with a mind-bending candle illusion inspired by Pepper's Ghost.

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!

Examine whether males or females are more likely to have a higher center of gravity.

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.

Measure the speed of the earth's rotation using protractors and meter sticks. This science fair project measures the angle of the sun in relation to earth.

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.

Learn how to be a bird scientist in this simple project of watching feathered friends in their habitat.

This fun science fair project for 8th grade demonstrates what Kepler's 3rd law predicts about a planet's orbital period and its distance from the sun.

Will male or female hair grow faster? Find out in this science fair project idea!

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!

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

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.

The apparent movement of the sun has been used to keep time since the bronze age. In this science fair project, kids plot solar time against mean solar time.

This science fair project examines the different composition of fungi and plants.

How does the size of a vibrating surface affect the pitch of a drum? Learn about drum size and pitch with this easy science fair project idea.

Do dogs understand English? Kids will find out with one of our favorite dog science fair projects that tests how dogs process human language and other cues.