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.

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.

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.

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!

In this challenge, students are tasked with creating a model roller coaster that a marble can travel through.

In this challenge, students are tasked with creating an insulated cup that will keep beverages colder for longer than a regular cup.

In this challenge, students are tasked with creating a car that can be powered by a balloon!

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