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.

The purpose of this science fair project is to build a basic radio.

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

Learn the basic structure of a DNA strand, which is the double helix, how genes form together, and the resemblance DNA has to a twisted ladder. Create a model.

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.

Wind is an important source of renewable, green energy. The purpose of this science fair project is to build and operate a windmill generator.

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!

In this windmill model science project, you will build a windmill to learn about wheel-and-axle machines and how these simple machines are used to do work.

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.

Using simple materials found around your home, you can reinforce the static electricity concept by helping your child build a simple device with zapping power!

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 idea builds models of various types of bridges and then determines which bridge design is the strongest.

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.