In this science fair project, apply the principles of leverage and force by building six simple machines designed to set weights in motion.

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.

This project compares the strength of one, two, and three-ply toilet paper.

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

In this experiment, your child will create two compost bins and see if he can determine what attracts fruit flies.

Milk is made of water and fat; but how can you separate the two? Find out in this color changing milk experiment.

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

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

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.

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

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

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

Kids learn how to prevent erosion by growing grass. They'll test soil with grass against raw soil in this revealing science fair project idea for 4th grade.

Find out whether packaged seeds actually do expire in this new science fair project idea.

Watch pre-packaged seeds and seeds taken from inside fruits and vegetables grow. Which ones will grow faster? Read more in this science fair project idea.

This project explores whether plants can live and grow when "watered" with juice, soda, or milk.

This science fair project idea determines if the color of light affects the growth of plants.

This science fair project idea determines the most effective method of preserving food.

In this project children practice the scientific method while playing with puffy paint.

In this project students experiment with making music using only glasses of water.

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

This science fair project idea explores whether the process used to dry the beans we eat for food renders them unviable.

Have you ever seen fruit decay? Find out if a fruit will rot faster if you open it versus leaving it untouched!

This science fair project idea investigates whether plants can survive being frozen.

Find out whether a longer airplane will fly farther or a wider paper airplane.

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

How do organic materials become soil? This science experiment measures what materials biodegrade.

The objective of this science fair project is to observe the differences in heat absorption for darker colors vs. lighter colors.

In this science fair project, kids observe the expansion of liquids when frozen and determine if some liquids expand more than others in the freezing process.

The objective of this science fair project is to analyze the effects of salinity and temperature on water.