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Kids often ask, "how tall am I?" This science fair project seeks to determine how well kids can guess their own heights.

Check out this fun high school science fair project idea to investigate how the cell membrane regulates what moves into and out of cells.

This experiment explores how listening in to a one-sided conversation affects concentration.

This science fair project idea compares whether ionic dryers leave hair in better condition than non-ionic dryers.

This science fair project idea studies whether eating a hearty breakfast before and exam will get them better test scores.

Discover whether eating certain foods will make you smell (not only bad breath) but through skin cells.

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

Cinnamon is tasty, but does it have super powers as well? Find out if cinnamon can repel mosquitoes in this outdoorsy experiment.

Science fair project idea that compares number and relative sizes of leaf stomata. Collect leaves of plant species, identify, observe stomata with microscope.

Science fair project the demonstrates Newton's Third Law using a milk carton filled with water.

Science fair project that uses iodine solution to demonstrate how starch is turned into sugar when it is chewed in the mouth.

Science fair project that determines how UV radiation emitted by the sun varies depending on the time of day, using a handheld UV detector

In this science fair project, students create their own miniature salt flats at home.

This experiment evaluates if a noisy environment makes it harder for test subjects to perform tasks that require hand-eye coordination.

Ant behavior is closely related to light intensity. This free science fair project idea examines how fast ants dig when they are exposed to to light and dark.

This experiment explores whether caffeine improves athletic performance.

This science experiment tests why guacamole goes brown and if leaving the pit in will stop guacamole from turning brown.

What is topography? Kids find out by learning to make and read a topographic map in this awesome science fair project idea.

This science fair project idea explores which kinds of earplugs are the most effective.

This science project challenges students to learn about and classify weeds and discover new practical uses for weeds.

Find out whether optical mice are useful on all surfaces or if there are drawbacks to this supposedly superior solution to the traditional roller-ball mouse.

Find out whether putting something on top of a plant will inhibit its growth.

This middle school science fair project evaluates test subjectsâ ability to determine what a person is feeling by reading their facial microexpressions.

How much gas is released into your stomach by your favorite beverages? This project examines which beverages produce the most gas.

This science fair project idea identifies and understands adaptations in birds.

Can cells be frozen? This science fair project provides information to answer this question.

Do you think you can blow down a sand castle with a mighty wind? Find out which material stands up best to erosion in this erosion experiment.

Determine how proficient you are at making estimations and learn how to make more reasonable estimates.

Do people only "hear" what they want to hear? Explore pareidolia and psychoacoustics with this easy science fair project that pits melody against white noise.

This science project researches the correlation between barometric pressure and wind velocity.