This science fair project idea investigates the difference in reaction times between boys and girls.

This science project teaches students the relationship between compost and plant growth. Students conduct an experiment with different types of compost.

This science fair project focuses on a polymer called hydrogel super absorbent crystal which absorbs water, swelling to many times its original size.

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.

This science fair idea examines hydrogel superabsorbent polymer crystals. They can absorb 500 times their weight in water. Can they absorb other liquids too?

Is it amplitude? Weight? Length of string? Kids will discover what factors changing the period of a pendulum depends on in this fun and easy physics experiment.

Learn how to demagnetize a magnet and how physics can explain this phenomenon with this enlightening science fair project.

What's the relationship between temperature, air humidity and static electricity? Kids will find out with this free static electricity science fair project.

This science fair project idea investigates if heat from direct sunlight is hotter than heat from reflected sunlight.

Help your child get a grasp on what it was like to build gigantic ancient structures with this easy engineering activity about science and physics.

Discover how and which salt melts ice the quickest.

Science fair project which compares the rate of temperature change and the maximum temperature as a result of the angle of light radiation.

Amaze your kids by separating a salt and pepper mixture using an "electric spoon" charged with wool.

In this fun science fair project idea learn about universal solvents and solutes and find out the solubility of several common liquid substances.

What chromosome combinations determine a fetus gender? Use probability to think about whether a sperm and ovum will create a male or female in this project.

How sensitive is your skin? Here's a fourth grade science experiment that lets your child figure it out.

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

Ready for takeoff! Make science fun and teach about levers and fulcrums as your child sends buttons flying.

This science fair project idea investigates how the height at which a pendulum is released affects the length of time it continues.

This science fair project idea determines if the temperature of rubber effects how high it bounces.

Learn about lateral earthquake motion and its effect on high rise buildings in this simple 4th grade earth science experiment.

Does the temperature of a magnet affect its strength? Learn about the relationship between magnets and temperature with this cool physics science fair project.

This science project challenges students to study deer behavior in their natural habitat- the feeding patterns, social behaviors, male to female ratio, etc.

Discover that the absorbency of fabrics depend largely on the shape and structure of the individual fibers that make up the fabric.

Learners hypothesize about and experiment with soil erosion in this hands-on activity.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

This science fair project idea explores substances that cause a bubble to last longer.

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

Here's a fun activity that will introduce your fourth grader to the concept of frictionless motion by constructing a hovercraft.

In this CD hovercraft science project, students will construct their own DIY hovercraft.