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.

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

In this activity, your child will be challenged to make a tower using paper cups.

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

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.

In this fun science experiment, kids will determine the best method for ripening avocados and discover the cool chemical reaction that makes this possible.

This science fair project idea investigates if fats add to the flavor of food.

This science fair project idea demonstrates that plants give off water.

Help your second grader observe the phases of the moon, and then let the fun loose: he'll get to chart his observations with marshmallows!

This science fair project examines how seeds hitchhike on animals and clothing.

Learn all about balance and motion as your child designs a corn maze!

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.

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 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.

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.

Get down to the rubber with this science project that tests the effectiveness of different types of erasers.

This science fair project idea demonstrates how air resistance contributes to denser objects falling faster than less dense objects.

What's the science behind those out-of-sight roots? Find out if you can trick roots into growing in different directions.

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.

This science fair project idea determines if crystals will absorb food dye and if colors will mix by the process of diffusion.

Science fair project that demonstrates the effect of detergent pollution on fresh water birds' ability to stay afloat.

In this science fair project, students use the streak test to tell minerals apart from each other.

This science fair project teaches students about wilting and browning of salad greens.

Kids will learn how to show the direction of magnetic field lines and create a permanent model using iron filings in this great science fair project idea.

In this activity, your child will be asked to create a boat that can successfully float while holding 25 pennies.

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

By incorporating natural materials and the powers of observation, your child will become a backyard naturalist while building early writing and drawing skills!

In this science fair project, we'll use a liquid crystal thermometer to find out whether exercising makes a difference in people's temperature.