Science fair project which determines whether the size or the thickness of a piece of paper has an effect on how many times it can be folded in half.

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

This project compares the strength of one, two, and three-ply toilet paper.

This easy and inexpensive paper towel science project introduces kids to important physical concepts like cohesion, adhesion, and capillarity.

Find out whether a longer airplane will fly farther or a wider paper airplane.

The objective of this science fair project is to explore the relationship between acidic and basic compounds.

This project explores whether nails, toothpicks, straws, or pen nibs are best for applying ink to paper.

In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.

This project determines whether Styrofoam, paper, or plastic cups are best for preventing ice from melting.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

In this physics project, learn about the relationship between light intensity and distance using a laser pointer, flashlight, and graph paper!

Here is a fun middle school science project on factors affecting solubility. Learn how dissolved solids can "crash out" to form crystals when conditions change.

In this project, build an insect model that shows how the head, thorax, and abdomen fit together! Learn insect anatomy by constructing a paper mache critter.

Marshmallows are made of sugar, water, and air pockets. Since the marshmallow is flexible, will air pressure cause it to expand when heated in a microwave?

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

Using a toy race car kids create a visual model of the Doppler Effect.

In this project children practice the scientific method while playing with puffy paint.

The goal of this golf science fair science fair project is to determine whether the temperature of a golf ball affects its elasticity and its rebound.

The purpose of this science fair project is to explore whether UV light passes through some colors and not others by looking at blue, red, purple, and clear.

Learn about the role of Earth's rotation on the Coriolis Effect and hurricanes in this science project. Model the Coriolis Effect on a hurricane's direction.

How does frost form? How fast does it form? Do this simple science project using a plastic glass, rock salt and some water to learn about deposition.

In this cool science experiment, learn about magnetism and poles, and test magnet strength to find out if two magnets are twice as strong as one.

Science fair project examining barometric pressure, and how it can be used to predict the weather. How does atmospheric pressures relate to weather conditions?

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

In this project combining nature, art, math, and science, children make rubbings of leaves then observe shapes and structures and sort the leaf images.

The moon doesn't produce its own light, so why can we see it shining in the sky? Learn about reflection and planetshine in this fun and easy science project!

In this project children discover, identify, and sort seeds from a variety of fruits and vegetables

This science project uses Mohsâ Hardness Test to show kids how to compare the hardness of different types of minerals.