Kids will conduct a cool limewater carbon dioxide test that can be performed with common household materials to learn about the chemistry of this common gas.

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.

The buoyant force of water explains why some objects float in water. But why do some objects sink? Find out in this physics experiment and learn about density.

This project will explore whether test subjects, deprived of points of reference, will, in attempting to walk a straight course, walk in circles.

Students pit the heat capacity of water against the heat capacity of oil while looking at the effects of dipole rotation in this cool science fair project idea.

In science fair projects, middle school students discover why nitrogen fixing bacteria are important to plant growth.

What happens when "coffee-addicts" miss coffee for 1 day? Find out in this science fair project idea!

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