In this science and engineering activity, children will explore types of tunnels and their purposes and then design and build a tunnel of their own.

Challenge your learner to design and build a city of their own in this creative engineering activity.

Inspire your child to put on her engineer hat for the day, as she builds her very own, double-decker bridge.

In this activity, children will work on their mathematics and engineering skills as they attempt to recreate the Eiffel Tower out of building blocks!

Have your child build a model of a coral polyp, one of the tiny animals that composes a coral reef.

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

This activity is a great way to stretch the boundaries of your child's imagination and build up important critical thinking skills.

Have your child build his own mini waterfall, and help him develop his planning, problem solving, and architectural skills.

The possibilities are endless with this fun Halloween-themed STEM activity! With simple supplies, your child will experiment, adapt, and use their creativity while they build structures using different specifications.

Help your child get a grasp on what it was like to build gigantic ancient structures with this easy engineering activity about science and physics.

In this activity, children will let their imagination run wild as they design and build a new planet in the solar system.

How do you tell time without a watch? Use the sun! This simple activity will show your child how to build his own sundial.

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.

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.

Your fourth grader will be astonished to discover the significance and intricacies of his spine as he builds a model of a human vertebral column.

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.

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

In this design challenge, your child will create a parachute for a small toy using typical household items.

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

What is it about a Slinky that causes it to walk down the steps? This simple experiment is a perfect illustration of both gravity and momentum.

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.

This craft is a great way to explore the fascinating world of spiders and their webs as you collect spider webs from around your house with your third grader.

Who needs paint, glitter, or crayons when you have natural art supplies right outside your front door?

Amaze your kids by separating a salt and pepper mixture using an "electric spoon" charged with wool.

Your child will create her own falling snowflakes using white paper and glue them over a tree, so it appears as if they are falling from the sky.