Science Fair Project Ideas has assembled a vast collection of science fair project ideas written by science teachers, professional scientists, and educational consultants on popular science fair topics ranging from physics and chemistry to biology and even sociology. We offer free science fair ideas suitable for every grade level, be it preschool, kindergarten, elementary school, middle school, or high school. Check the boxes in the sidebar to filter your results, or use the search bar to find that perfect science fair project or experiment your child will be sure to love.

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Word color association is just a fancy way to talk about the way we connect colors with words.
First Grade
Psychology and Sociology
This science fair project idea examines whether boys and girls differ in reflexes.
Elementary School
Fourth Grade
Learn about our cognitive capacity of attention and to learn about factors that influence attention.
Middle School
Psychology and Sociology
Have you ever wondered how many numbers most people can memorize? Test your friends to find out!
Third Grade
Psychology and Sociology
Can you fool your eyes and your brain with an optical illusion?  The purpose of this science fair project is to demonstrate various kinds of optical illusions.
Elementary School
It's the day before the test, and you still have a ton to memorize! Sound familiar? Test memorizing techniques to help yourself out next time.
Elementary School
Psychology and Sociology
Do human lie detectors exist? Charge up your powers of observation to see if you can tell a lie from the truth.
Elementary School
Psychology and Sociology
Is it a square or a circle? See if you can trick your friends with this zany science project!
Second Grade
Psychology and Sociology
Determine which factors promote the greatest  memory interference. Administer test, time how long it takes subjects to complete different tasks.
High School

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