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.

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

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

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?

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

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

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

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 explores whether the process used to dry the beans we eat for food renders them unviable.

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

This science fair project examines how seeds hitchhike on animals and clothing.

This science fair project idea investigates how the height at which a pendulum is released affects the length of time it continues.

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

This science fair project idea investigates how color affects temperature.

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.

This easy and inexpensive paper towel science project introduces kids to important physical concepts like cohesion, adhesion, and capillarity.

This project determines what category of person is most likely to be ticklish.

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

This science fair project idea demonstrates that plants give off water.

What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.

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

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.

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

What causes dilated pupils? Young scientists will find out by applying what they already know about changes in pupil size and making models of the pupil.

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

What is a wedge? Kids find out by experimenting with different wedges in this simple science fair project idea.