This science fair project idea determines whether eating before or after exercise is more beneficial to health and performance.

Observe which kind of fresh long-stemmed flower will last the longest after being picked.

Is exercise a cellular activity? Check out this fun science fair project idea to compare the carbon dioxide production before and after exercise.

Study the impact of environment on seed germination among three materials: soil, paper towel, and cloth. Note when seeds germinate and how well they germinate

This project examines whether humans can intuitively grasp numeric values greater than three.

This science fair project idea explores whether boiling and freezing water will have an effect on how much it weighs.

This science fair project evaluates if and how eating a large meal affects ability to perform mental tasks.

Compare different remedies for cooling the mouth after eating spicy food.

This project is about after-images and what possibly affects them.

This project determines how much the rebound rates of tennis balls change after ten games.

This experiment examines if space objects become round after reaching a certain mass.

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

Determine whether a hot liquid cools off faster when liquid is added before or after a two minute wait.

This experiment will evaluate bacterial content on toothbrushes before and after different cleaning methods to determine which method of disinfecting is best.