Determine how different measurements of the same object might yield different values. Provide as many reasons that you can think of.

How fast does light travel in different mediums? Kids conduct a cool refraction experiment in materials like water and air for this science fair project.

How does smell affect taste? Ready your taste buds--in this project, you'll gather some test subjects and do a taste test to see how much smell affects taste.

Science fair project that helps visualize how the human brain functions by constructing a model of a brain.

Determine if each hemisphere specializes in dealing with specific functions. Include illustrations of the brain, it hemispheres.

Kids will build a turtle habitat in order to observe the climate preferences of this cold-blooded reptile.

Learn how to relight a candle by lighting the vaporized wax in the smoke, and test how various kind of wax and candle brands relight differently.

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

In this science fair project, kids measure how weather conditions affect how fast a puddle evaporates.

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

Demonstrate Newton's laws of motion by examining the relationship between mass, force, and acceleration during free-fall.

This science fair project examines how seeds hitchhike on animals and clothing.

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

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

This project determines whether hands-on practice, mental practice, or no practice leads to better shooting of free-throws.

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

Students will investigate the illumination durations and intensities of different luminous substances of different colors of the spectrum.

Check out this cool science project idea to learn about rocks and explore the cycles of formation, breakdown, and reformation of rocks in the Earth's crust.

Science fair project that examines the physical features of elephants and butterflies and draws conclusions about their similarities.

What keeps a an item cooler, polymer crystals or ice? Find out in this cool science experiment!

In this science fair project, students examine under what conditions individual plants release seeds and how far the seeds are released.

This fun elementary school science fair project idea helps students in designing an amusement park using their knowledge of forces and simple machines.

Determine which seeds are most likely to survive harsh winter conditions (low temperatures).

Demonstrate the relationship between mass, volume and density. Measure displaced water, and weigh object to calculate mass and density.

Build a 3d animal cell model with this cool science fair project, which helps kids visualize and understand the function of a cell's parts and organelles.

Research overview of architecural acoustics. Design and build a whispering wall from wood or plastic. Test which materials work best.

This experiment will explore whether adding different substances to a gel affects its strength.

In this experiment, students create music with subliminal messaging to try to influence people's decision-making.

In this science fair project, apply the principles of leverage and force by building six simple machines designed to set weights in motion.

The objective of this science fair project is to observe the properties of friction and apply this knowledge to search for a near-frictionless surface.