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This science fair project idea teaches about the size of two different systems: the solar system and an atomic system.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

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

This project examines who can jump higher, boys or girls, younger people or older, and how these two factors, gender and age, interact with one another.

Learn about how we localize objects and beings in space through sound and about monaural auditory mechanisms and binaural auditory mechanisms.

Test out various brands of permanent markers to see which one is least water soluble.

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

In this science fair project, students will create a model of a shoreline, observe erosion and examine how jetties prevent erosion.

This science fair project idea researches the different layers of the atmosphere and creates a visual representation of the atmospheric layers.

This science fair project idea investigates how a bottom keel helps keep a boat from rocking back and forth.

Why does honey crystallize? This science fair project project answers this question and identifies the variable that makes this sweet solute crystallize faster.

In this activity, you child will learn about how heat changes food. On the next sunny day, head outdoors to make a treat in an outside oven! Here's how:

Science fair project that determines what percentage of air is made up of oxygen by examining the chemical reaction between oxygen and rust.

In this science fair project, we learn how air molecules move as a result of density, convection, and air currents.

How do icicles form and what do they look like? Do this free science fair project and watch the formation of icicles occur right before your eyes.

Have your kid determine if a goldfish can be conditioned to expect food the same way Pavlov's dogs did with this fascinating science fair project.

The objective of this science fair project is to set up a compost bin to convert food scraps and organic waste.

Create uphill flow of water by using a siphon. Create vacuum by suctioning one end of tube, and submerge it under water. Watch the direction the water travels.

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

Check out this cool and free middle school science fair project idea on how to make a solar oven.

Examine the effect of pressure on carbonation in soda.

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

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

In this science fair project, students determine whether a bean plant grows faster and taller using a traditional soil planting method or hydroponic method.

This science fair project idea explores plant growth from a bulb, root, and a stem and investigates asexual plant reproduction.

In this fun experiment, we'll find out how color affects heat absorption!

This experiment will explore whether adding different substances to a gel affects its strength.

This experiment will evaluate bacterial content on toothbrushes before and after different cleaning methods to determine which method of disinfecting is best.

Here is a cool and easy science project to determine the rate of chlorophyll breaks down and how it affects the color change of grass from green to yellow.