This science fair project investigates why the number of visible stars changes from place to place.

In this science fair project, you'll make a "ghost" appear in a test tube, and learn about what happens when hot water and cold water interact.

This fun science fair project idea helps students learn how acid rains are formed and explore how acid rain damages the environment.

This science project has students collect wood samples and invent new uses for different types of wood based on its properties.

This science fair project idea explores how much force is needed to move a lever at different distances from the fulcrum.

In this experiment we will be determining whether birds prefer certain colors of seed.

How do the phases of the Moon and gravity cause spring tides and neap tides? Does the Sun play a role in the tides? Figure it out in this fun science project!

In this fun experiment, learn about brand awareness and the influence of media on children by testing logo recognition in different age groups.

Discover whether the â5-second ruleâ is effective at determining whether food is still safe to eat after being dropped on the ground.

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

Is horse manure a possible energy source in a crisis? Use calorimetry to find out how much energy horse manure can produce in this science fair project.

This project determines the age of a tree using a growth factor chart instead of cutting the tree down to count the rings in its base.

Science fair project that helps you better understand density by comparing the relative densities of cans of Coke and Diet Coke.

Science fair project that examines how yeast grows, and which conditions allow for optimal growth. What types of nutrients does yeast prefer?

This science fair project idea determines the most effective method of preserving food.

In this cool physics experiment, use double plane mirrors at various angles to learn about light reflection. Then, see if you can solve a puzzling problem!

This science fair project idea explores whether people have an innate feel for the passing of time from a few seconds to 20 minutes.

This science fair project idea explores whether talking to a plant will help it grow.

Check out this cool science fair project on identifying rocks and minerals for kids.

Science fair project which teaches you about the principles of physics within a vacuum by creating a vacuum chamber.

This project examines whether people's taste perception is influenced by what they see.

This science fair project idea creates a sedimentary rock and to investigate what takes place during the rock cycle.

What is biodiversity? Kids will study different areas of their backyards to see which is the most diverse to learn about biodiversity and random sampling.

Learn how to make a hygrometer to measure relative humidity in this project. Make a sling psychrometer hygrometer with gauze, thermometers, and a bottle.

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.

This science fair project idea develops an understanding through experimentation of which shapes are the most structurally strong.

This science fair project idea compares biodiversity between drops of water.

What do ants eat? Kids find out by observing a colony of ants in this cool zoology science fair project for 4th grade.

Find out whether a longer airplane will fly farther or a wider paper airplane.

Science fair project that teaches you about chemical indicators and how to make your own in order to identify various mystery solutions.