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

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

In this insulation experiment, you'll learn which clothes keep you warm in the cold, and which make you shiver.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

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

The purpose of this science fair project is to demonstrate how yeast, a fungus, causes bread to rise.

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

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.

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

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

Get this cool science fair idea to explore how arctic tundra animals change their behavior and adapt to survive in long, cold winters.

What are buttress roots? In this fun science project, make a model of a rainforest tree and learn how they help trees survive in the tropical rainforest!

This science fair project investigates whether tapping the top or the side of the can will stop a vigorously-shaken can of soda from exploding.

This science fair project idea explores whether cats can be trained in the same way that dogs can.

What is surface tension? Kids will discover how water-skating insects use surface tension to keep from sinking by making a model water walker.

There are many benefits to bugs and insects. This science project shows how cockroaches, termites, and other critters benefit our planet.

What is the hydrologic cycle and how does it work? Check out this fun and easy science project where you will model and learn about Earth's water cycle!

In this science fair project, students examine under what conditions individual plants release seeds and how far the seeds are released.

The objective of this science fair project is to explore the relationship between acidic and basic compounds.

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

Get ready for a yummy taste test! Just pour the milk -- and make sure you have some chocolate chip cookies on hand.

In this awesome science fair project idea, kids will be attempting to pick up different objects using snail slime.

Kids will learn how to show the direction of magnetic field lines and create a permanent model using iron filings in this great science fair project idea.

The purpose of this science fair project is to explore whether UV light passes through some colors and not others by looking at blue, red, purple, and clear.

Soil is made up of different layers. How far down do you need to dig to find the soil horizon, or the place where bits of leaves and branches become soil?

Are your taste buds up for the challenge? Put tongues to the test with this science fair project that examines who enjoys sour flavors more, adults or kids?

In this science fair project, students focus sunlight with a magnifying glass and trap shorter waves to melt ice.

In this science fair project, kids measure how weather conditions affect how fast a puddle evaporates.

Study the life cycle of the common blowfly as it relates to forensic investigation. Record the first time you see flies, maggots, and eggs.

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.