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.

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

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

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.

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

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.

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

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

This two-ingredient dough, sometimes called "moon sand," is a quick and cheap way to let kids explore their senses, build fine motor skills, and play.

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 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.

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.

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

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

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

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

What can you do with hair after its cut? This science project teaches you practical uses for human hair.

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

Assess physical and mental states of subject before and after drinking coffee. Compare initial expectations with their reported conditions.

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