Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

Do dogs understand English? Kids will find out with one of our favorite dog science fair projects that tests how dogs process human language and other cues.

This experiment investigates if stress alters body temperature.

This science fair project idea studies whether a religious sleeping schedule relates to a higher IQ.

This project will explore whether people are emotionally susceptible to suggestions of both humor and sorrow.

This science fair project idea examines whether boys and girls differ in reflexes.

This experiment evaluates whether frequent texters have better finger dexterity compared to people that rarely use text messaging.

This experiment evaluates if the temperature of the environment that you work in affects your ability to perform mental tasks.

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

The objective of this science fair project is to determine the rate at which participants can respond to different patterns.

This experiment explores whether caffeine improves athletic performance.

The objective of this experiment is to evaluate which types of people are most impacted by the McCollough effect.

In this science fair project, students will use methylene blue to study the presence of aerobic bacteria in milk.

This science fair project investigates which of two learning modes most commonly used in school, visual and auditory, is better for information retention.

This science fair project evaluates which sense produces the fastest response time: hearing, touching, smelling or seeing.

This experiment will evaluate if the environments that people work in affect their speed and accuracy in performing mental tasks.

This experiment evaluates whether the phenomenon of "choice blindness" occurs more often with men or women.

This experiment evaluates whether motivational music can improve athletic performance.

This science fair project idea focuses on two classes of sugars monosaccharides (fructose) and disaccharides (sucrose or table sugar).

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

In this experiment you will evaluate whether praise improves athletic performance.

This experiment evaluates if personality influences whether a person prefers dogs or cats.

This experiment investigates whether the primacy effect is observed more frequently in specific populations of people.

This science fair project explores whether musicians are better than non-musicians at distinguishing and understanding speech in noisy environments

This science fair project idea explores how far the average human can see.

This experiment uses personality assessments to evaluate the prevalence of specific character traits in left-handed and right-handed people

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

There is debate about whether chalkboards or whiteboards are better. This experiment explores which leads to better retention of visually-displayed information.

This experiment explores whether reading text on a computer screen or type on paper leads to better retention of the information read.