Prove that the Earth is not flat. The objective of this science fair project is to measure the angle of the sun and calculate the circumference of the Earth.

This science fair project idea examines whether boys and girls differ in reflexes.

What are buttress roots? In this fun science project, make a model of a rainforest tree and learn how they help trees survive in the tropical rainforest!

Science fair project which simulates the global conveyor belts on a small scale, and observes the effects of wind, density and temperature on water movement.

This 4th of July, explore fourth grade science and make some safe fireworks in your own backyard using soda pop!

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

Making your own glass cleaner is easy, effective and inexpensive!

Check out this cool science fair project idea to explore the risk of mechanical deterioration of artifacts placed in a storage box due to mold outbreaks.

In this fun project, use a memory game to test various age groups and determine whether aging directly affects short-term memory loss.

In this cool science fair project idea, kids conduct the ruler drop test on volunteers to determine whether reaction time can be improved with practice.

Science fair project in which you will start a fire from scratch without using matches or a lighter.

This science fair project idea examines whether plants are still able to grow normally if they are turned upside-down.

This science fair project idea examines liquids of different densities.

For a fun family activity to introduce your child to genetics, have your child go on a search for dominant and recessive family genes!

The project determines which laundry detergent is best for cleaning clothes.

Science fair project which teaches you how to make your own homemade glue by combing curdled milk with baking soda.

Magnets vary in strength. Have your young scientist figure out which kind of magnet is the strongest when you have him conduct this attractive experiment.

This science fair project idea provides evidence that air is everywhere and takes up space.

Does putting soapy water on plants help or hinder plant growth? Kids learn about greywater and how it affects plant growth in this cool science fair project.

Here's a fun activity that will introduce your fourth grader to the concept of frictionless motion by constructing a hovercraft.

This science fair project idea produces sounds by creating vibrations using different objects.

This science fair project idea explores whether a sundial is as accurate as an atomic clock when telling time.

This project investigates the affect of storage temperature on microwave popcorn.

Science fair project which uses coins flips to visually demonstrate the probability of an event and how to express it.

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

In this activity, children will let their imagination run wild as they design and build a new planet in the solar system.

Students explore hot desert plant adaptations in this cool science fair project by observing how these organisms prevent excessive transpiration.

Construct batteries that make electricity from fruits with this fun science fair project.

In this microwave plant experiment, find out whether microwave radiation will affect radish seed germination. Will it help or hinder the plants' growth?

In this fun science project, learn about what happens to cut fruit and experiment with how to stop apples from turning brown.