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

What animals are most popular? This project affords practice in data-collection, record-keeping and data-analysis through the investigation of this question.

Here's a great activity that uses corks and toothpicks to create a fleet of floating boats. Which design makes for the most seaworthy vessel?

In this science fair project, students focus sunlight with a magnifying glass and trap shorter waves to melt ice.

What are the benefits of good posture? Kids will learn about the cognitive effects of good posture through conducting and observing a controlled experiment.

Explore how dielectric heating comes into play when microwaving various liquids in this science project. This test will help you understand how microwaves work!

When you rub a balloon on your head, your hair stands up; but is that true for everyone? Does hair color affect static electricity?

Enter the buzz worthy world of bee watching and find out what time bees like to wake up!

In this experiment, your child will create two compost bins and see if he can determine what attracts fruit flies.

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

Test out the pH levels of soil in your backyard versus soil in more wild environments to solve this science case.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

This science project encourages students to investigate the Mozart Effect, the idea that classical music promotes learning.

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

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

How powerful is the reaction between baking soda and vinegar? Find out here!

This science fair project teaches about mold. Students will test different foods to see which grow mold the fastest.

The objective this science fair project is to determine whether a bigger bag will allow a homemade hot air balloon to fly higher than smaller bag.

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

What does a raindrop look like when it splashes on the ground? Is each raindrop unique like snowflakes? Find out how raindrop size varies in this experiment.

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.

Learn how to demagnetize a magnet and how physics can explain this phenomenon with this enlightening science fair project.

The purpose of this science fair project is to determine which conditions and materials quicken the composting process to make the best compost.

What is a compound microscope? Kids find out by making one of their own in this cool science fair project.

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

Learn whether writing things down really makes things easier to remember.

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

The objective of this science fair project is to experiment with balancing everyday objects and observing the the effects of gravity on materials.

Will increasing the amount of salt in water effect how slow or fast the water freezes?

What is the best stain remover for clothes? In this fun and easy science fair project idea, students will identify the best method for laundry stain removal.