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

In this fun science fair project idea, kids will experiment with various methods in order to discover the fastest way to cool a soda.

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 keeps a an item cooler, polymer crystals or ice? Find out in this cool science experiment!

This science fair project idea creates cool new colorful fabric pattern designs and experiments with the mixing of colors.

This science fair project idea researches how your choice of clothing affect how hot or cool you feel during the day.

How does salinity affect the point at which water freezes? Kids will find out by performing this cool melting ice experiment.

This cool science fair project teaches kids about temperature, density and buoyancy using balloons that float with normal air. No helium required!

In this fun science experiment, kids will determine the best method for ripening avocados and discover the cool chemical reaction that makes this possible.

Does the temperature of a magnet affect its strength? Learn about the relationship between magnets and temperature with this cool physics science fair project.

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

Discover how to make fake snot with this cool science fair project idea to learn about polymers, enzymes, and more.

Kids will learn some cool stuff about chemical reactions by determining what happens when you mix different concentrations of hydrogen peroxide and yeast.

How clean is the air we breathe? The answer might surprise you. Learn how to investigate local air quality with this cool science fair project.

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

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.

How does water pressure change with depth? Kids learn how pressure works underwater with this cool and easy demo.

In this cool science fair project idea, kids conduct the ruler drop test on volunteers to determine whether reaction time can be improved with practice.

Check out this cool science fair project idea that models the behavior of the cold desert plants: xerophytes and halophytes.

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

Kids build a desert food chain, desert food web, and desert food pyramid in this cool science fair project to learn about trophic levels and consumers.

What is persistence of vision? With this hands-on science fair project idea, students will demonstrate this cool and dramatic phenomenon in their own classroom.

Check out this cool science fair project idea to explore which other common animals besides scorpions glow under a UV Black light.

Kids learn how to manipulate additive and subtractive colors to send secret messages with red colored filters in this cool science fair project idea.

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.

Kids will conduct a cool limewater carbon dioxide test that can be performed with common household materials to learn about the chemistry of this common gas.

In this cool science experiment, learn about magnetism and poles, and test magnet strength to find out if two magnets are twice as strong as one.

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

Check out this cool science project idea to learn about rocks and explore the cycles of formation, breakdown, and reformation of rocks in the Earth's crust.