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.

Kids will build a turtle habitat in order to observe the climate preferences of this cold-blooded reptile.

In this project, you'll build a model of the earth, complete with all seven continents and four major oceans.

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!

Kids build a desert food chain, desert food web, and desert food pyramid in this cool science fair project to learn about trophic levels and consumers.

In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

How does a compass work? What's a magnetic field? Kids will build their own compass at home to find the answers in this great science fair project idea.

Build a 3d animal cell model with this cool science fair project, which helps kids visualize and understand the function of a cell's parts and organelles.

This science fair project investigates why the number of visible stars changes from place to place.

Future engineers, unite! Discover how to keep a sandcastleâs bridge from falling into the moat.

This science fair project idea develops an understanding through experimentation of which shapes are the most structurally strong.

Play with balance and simple engineering as you hurry to create a sturdy rock tower.

What is a compound microscope? Kids find out by making one of their own in this cool science fair project.

Prove that the Earth is not flat. The objective of this science fair project is to measure the angle of the sun and calculate the circumference of the Earth.

Climates with more snowfall have more coniferous forests and fewer deciduous ? Learn about how pine trees in a coniferous forest adapted to withstand snow.

This science fair project idea's objective is to become familiar with items your family regularly throws in the trash.

Science fair project idea that examines different physical characteristics of a chosen animal. Make educated guesses about evolution based on animal's form.

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

Spiders don't go to grocery stores or fast food chains to get their food -- they set up traps and wait for their food to come to them!

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

Examine whether distilled water, spring water, or regular tap water yield faster plant growth.

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

In this science fair project, kids will be able to see where germs reside on their hands while gaining insight into the benefits of thorough hand washing.

This science fair project idea experiments with spinning color wheels and optical illusions.

This science project has students collect wood samples and invent new uses for different types of wood based on its properties.

This science fair project idea teaches how the gases and pollution in the air affect the earth's atmosphere temperature.

This science fair project idea highlights decomposition rates by comparing how long it takes an item to decompose in a compost pile vs. a landfill.

This science fair project demonstrates the magic of arches by challenging students to stack telephone books on top of eggs without breaking them.

In this science project, the center of gravity is explored.

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.