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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.

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.

Do different types of oil mix or stack? Find out in this science fair project idea!

Can a horse lead itself to the carrot? Train your horse with carrots and boxes and test horse memory in this fun zoology science fair project.

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

This science fair project idea investigates how magnetism can defy the force of gravity.

This project explores whether plants can live and grow when "watered" with juice, soda, or milk.

Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

Use pepper and soap to discover some fun facts about the properties of water.

Science fair project that develops latent fingerprints on a non-porous objects by converting superglue from a solid state to a gaseous state.

Play with balance and simple engineering as you hurry to create a sturdy rock tower.

Science fair project that examines the different types of precipitation, evaluates the density of snow and calculates the ratio of snow-to-liquid.

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 science fair project, students discover how sedimentary layers form as sediments like mud, silt and sand settle over time.

Milk is made of water and fat; but how can you separate the two? Find out in this color changing milk experiment.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

How can we describe the relationship of magnetic field strength vs. distance? Kids will find out with this free science fair project idea.

How does water pressure change with depth? Kids learn how pressure works underwater with this cool and easy demo.

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 project teaches young students about germs, bacteria, and the importance of washing their hands. Students will test what is the best way to wash.

In this experiment, your child will create two compost bins and see if he can determine what attracts fruit flies.

Kids will build a turtle habitat in order to observe the climate preferences of this cold-blooded reptile.

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 science fair project, you'll make a "ghost" appear in a test tube, and learn about what happens when hot water and cold water interact.

Kids will make a beautiful rainbow in a jar and learn what enables different types of liquids to remain distinct in separate layers.

In this science fair project, kids observe the expansion of liquids when frozen and determine if some liquids expand more than others in the freezing process.

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

Science fair project that examines the behavior of water and gravel in creek beds and the formation of sedimentary rocks.

This science experiment has students test whether a snail moves faster on concrete or dirt.

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.