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

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.

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.

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 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.

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

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

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

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

Science fair project that examines how to grow bacteria in a controlled setting, using simple materials from around the home.

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

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

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

This science project encourages students to investigate the Mozart Effect, the idea that classical music promotes learning.

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 science fair project teaches kids experimental design and how to test if subjects can really sense if they are being watched.

This project investigates the affect of storage temperature on microwave popcorn.

Explore how sound waves are reflected and absorbed by producing echoes. Analyze which locations produce echoes.

The purpose of this science fair project is to determine which conditions and materials quicken the composting process to make the best compost.

Learn whether writing things down really makes things easier to remember.

The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

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

Will potatoes spud or sprout faster in dry, dark, or cold conditions? Find out in this science fair project idea!

The goal of this evaporation experiment is to learn about how different external conditions affect drying time.

This science experiment tests whether warm or cold water works best in making cut flowers last longer.

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.

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

Kids will learn how to make a steam powered rocket boat, also called a putt putt boat or a pop pop boat, in this great science fair project for 4th graders.