What is the coldest temperature possible? In this cool experiment, you'll calculate absolute zero by extrapolating data on the temperature and volume of gas.

Score a bull's eye with this cool science fair project on horizontal projectile motion. Guide a marble to its target and predict its trajectory using math!

Slip some science into storm watching with a homemade rain gauge!

This project determines the age of a tree using a growth factor chart instead of cutting the tree down to count the rings in its base.

Find out whether pacing in long-distance running actually acquires for drastic changes in finishing times versus running super-fast at the start.

Kids will enjoy this cool demonstration of Newton's Third Law and the conservation of linear momentum.

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

The projects describes the correlation between Gravel Run and Centreville Landing in terms of pH, dissolved oxygen, turbidity, and temperature.

Use applied math to model orbital eccentricity in this cool science fair project for 7th grade.

Show your fourth grader how to see her heart in action. Make a simple device out of a drinking straw and clay to help her spot the movement of her pulse!

In this activity, young learners will make a balance using a plastic hanger and weigh a variety of small objects using candy corn.

Do people only "hear" what they want to hear? Explore pareidolia and psychoacoustics with this easy science fair project that pits melody against white noise.

This bread mold experiment will help your child learn about mold, and he'll develop important hypothesis-making and experiment-designing skills.

What kind of fabric holds dye best? How can you improve a dyed fabric's colorfastness? In this colorful project, test colorfastness using mordants and bleach.

Which music genres have the fastest tempos? The slowest? This experiment determines if there's a relationship between beats per minute in a song and its genre.

In this "paper and pen" science fair experiment, students will research the difference between standard time and astronomical mean time.

This simple experiment serves as an introduction to the greenhouse effect.

Would it hurt to skip brushing your teeth just this once? Let's find out by seeing which foods produce the most mouth bacteria.

In this math and science activity, help your middleschooler learn about proportion and measurement with just her shadow and a tape measure!

Find the North Star, and measure your latitude! The purpose of this science fair project is to find latitude and learn about geographic locations.

The objective of this science fair project idea is to examine light refraction as it passes through liquid crystals.

In this science experiment, observe convection currents forming and learn about how heat energy moves in liquids from hot to cooler areas through convection.

Put your young paleontologist's puzzle-solving skills to the test by having her hunt for dinosaur bones and then assemble them to create dinosaur skeletons.

A cool physics science fair project idea for 7th grade exploring the application of distance, velocity, and time equations.

This interdisciplinary card game will have your third grader working on math facts as he travels through the solar system!

Is the birthday paradox really a paradox, or just an intriguing problem that defies intuition? Find out with this birthday paradox science fair project.

Science fair project that tests the correlation between outdoor temperature or weather conditions and the number of visible stars at night.

Determine the relationship between the speed of a sound and the temperature of the air it passes through.

This science fair project investigates why the number of visible stars changes from place to place.

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.