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 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.

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.

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.

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.

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 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.

This science fair project on testing water hardness is a great introduction to practical chemistry. Test and learn the difference between hard and soft water.

Create a DIY Electromagnet! Using a 9v battery to create an electrical field around a nail, students explore electromagnetism in this cool science project idea.

The goal of this project is to create an exciting topographical map out of dough.

This science fair project idea identifies clouds as a means of predicting the weather.

Students will investigate the thermal conductivity of metals by learning how to measure thermal conductivity with this fun and easy science fair project idea.

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!