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

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

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

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

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

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

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

Observe how your brain works while it is focused on one thing, and how it works while you are distracted by another thing.

Gather some friends for a bubbly soda taste test do determine calories' role in your favorite drinks.

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.

Do you think heat can affect a plant's growth rate?

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

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

Plants and light seem to be good buddies, but how far does the friendship really go?

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

In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

This science fair project idea examines whether adding gelatin causes a solid to have a higher melting point and/or melt slower.

Do plants get crowded? Have your curious kid investigate how plants respond if they're forced to grow together in a confined space.

Do hand soaps and sanitizers prevent the growth of bread mold? If so, why? Kids will find out with this fun and informative science fair project idea.

In this project, build an insect model that shows how the head, thorax, and abdomen fit together! Learn insect anatomy by constructing a paper mache critter.

When you cut a flower to put into a vase, it'll eventually wilt, even with water and sunshine. But is there another scientific secret to keeping flowers fresh?

How do icicles form and what do they look like? Do this free science fair project and watch the formation of icicles occur right before your eyes.

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

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.

What's the science behind those out-of-sight roots? Find out if you can trick roots into growing in different directions.

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

Science fair project that examines how winter storms form and the relationship between temperature, moisture and snow.

Science fair project examining barometric pressure, and how it can be used to predict the weather. How does atmospheric pressures relate to weather conditions?

This science fair project looks one of the most important factors affecting seed germination: water. A fun and easy plant biology experiment for 3rd graders.

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