Is there a relationship between caffeine and heart rate? Students will determine the effect of caffeine on heart rate in this fun science fair project.

Determine the differences between various bicep exercises, both in terms of how much muscle exertion they create and how they affect your heart rate.

Test for a correlation between perceived color and heart rate. Using a stethoscope and stop watch, measure the heart rate (beats per minute) of volunteers.

In this science fair experiment, students learn about the scientific principles behind Doppler ultrasound.

Determine which video game elevates the heart rate best and burns the most calories.

Does fear cause the same physiologic responses in men and women? This experiment measures people's blood pressure and heart rate while watching a scary movie.

This project explores whether there is an effect on people, including heart rate and self-expressed mood, when they are exposed to different types of music.

Find out whether pacing in long-distance running actually acquires for drastic changes in finishing times versus running super-fast at the start.

Check out this cool science fair project idea to explore the relationship between pulse rate and blood pressure in healthy people.

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

This project determines what percentage of test subjects react adversely to the sound of fingernails on a chalkboard and explores their physiological responses.

Is there any correlation between hot tubs and high blood pressure? Kids discover the answer (and its biological basis) in this cool science fair project.

This science fair project idea explores how enzyme inhibitors, active sites, non-competitive enzyme inhibitors, and substrates work.

Look at people's face shape. Do you think their face shape affects your perception of kindness? Find out more in this science fair project idea!

This fun experiment provides a concrete and visually striking illustration of photosynthesis.

Can playing video games trigger an adrenaline rush even though there's no real danger? In this cool experiment you'll learn all about how fight-or-flight works!

This science fair project idea investigates if fats add to the flavor of food.

Demonstrate which cooking method gets rid of the most fat.

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

Learn about the anatomy of the autonomic nervous system and its relationship to the rest of the body.

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

This science fair project idea focuses on saturated and unsaturated lipids (fats and oils).

Do human lie detectors exist? Charge up your powers of observation to see if you can tell a lie from the truth.

This science experiment examines the role of fat in food, especially in making bread rise and whipping cream.

In this science project, learn about water transport in plants and make a beautiful dyed floral arrangement with cohesion, adhesion, and xylem tubes!

Free science fair project idea that measures change in flexibility with age, using a variety of flexibility tests like Sit & Reach.

The goal of this science fair project is to identify the galactic center of the milky way using globular clusters, as found through Google Earth.

Get this cool middle school science fair project idea on how to conduct a flame test to detect the presence of certain metals in chemical compounds.

Is there more air particulate matter in an urban or rural environment? Test your knowledge with this science fair project.

Wild-type and GAPDH mutant Caenorhabditis elegans were used as an example of how glucose or sugar affects the lifespan of humans.