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

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

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

This science fair project idea explores whether people have an innate feel for the passing of time from a few seconds to 20 minutes.

In this "paper and pen" science fair experiment, students will research the difference between standard time and astronomical mean time.

Learn how to tell time by the sun with this cool science fair project idea that tracks how the accuracy of a sundial changes over time.

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 experiment evaluates if people have an accurate perception of how much personal time they spend interacting with technology.

In this cool science fair project idea, kids conduct the ruler drop test on volunteers to determine whether reaction time can be improved with practice.

A cool physics science fair project idea for 7th grade exploring the application of distance, velocity, and time equations.

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

Do your laundry and your science project simultaneously! This science fair project investigates whether the color of a garment affects the time needed to dry.

Does your middle school teenager have good reflexes? Gauge his reaction time in this science and math activity that requires only a yardstick and a friend.

This experiment will evaluate how texting and talking on cell phones influence reaction time.

In this science fair project on the relationship between distance and time, kids explore the behavior of gravitational acceleration through direct observation.

How do crystals form? In this science fair project, students will use three different saturated solutions to see how different minerals form crystals over time.

This science fair project idea teaches that time always passes at the same rate and nothing we do in our daily life âreallyâ affects how fast it moves.

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

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

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

The apparent movement of the sun has been used to keep time since the bronze age. In this science fair project, kids plot solar time against mean solar time.

This science fair project idea discovers the average time it takes for a person to remember something completely.

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

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