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.

Show your fourth grader how to see her heart in action. Make a simple device out of a drinking straw and clay to help her spot the movement of her pulse!

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.

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.

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.

Grow borax crystals and get your child excited about Earth science with this crafty science experiment.

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).

This winter garden project is just about bomb-proof, and believe it or not, it might even make a great gift. So get craft happy with your first grader!

Want to help make studying the nervous system a little more fun? This thinking cap is a great way to learn external human brain anatomy.

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.

How sensitive is your skin? Here's a fourth grade science experiment that lets your child figure it out.