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.

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!

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

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.

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

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

This science fair project explains the process of how the lungs expand and contract with the help of the diaphragm.

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

In this open-ended activity, students will be given a small quantity of three types of materials and asked to design a prototype for “something that will improve the school.”

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

In this project, a magnet is used to collect iron from breakfast cereals.

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

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

Young physicists will wrestle with a discrepant event: the Hammer Ruler Trick. They'll make some inferences about torque, balance, and center of gravity.

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

Have your child kick off their summer vacation by making a miniature water slide!

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

In this activity, your learner will be challenged to create their own tic-tac-toe grid out of building blocks.

This science fair project demonstrates the principles of reflection through simple experiments involving mirrors and light.

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.

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.