Determine whether carpet placed on a lawn will kill grass and weeds. Choose an area of lawn that you would like to remove, record grass that is dead or dying.

Check out this fun and easy science fair project idea on germination of a seed and learn to identify exterior and interior parts of a bean seed.

This science fair project idea explores which fruit molds the fastest.

Can you dig it? This science experiment isn't for kids who like to keep their hands clean.

This experiment investigates if small changes in your diet can alter your basal body temperature.

How does light affect plant growth? Do different colors of light work better than others? Find out in this classic science fair project idea.

This high school science fair project investigates if small changes in your diet alter the pH of your saliva.

This science fair project idea attempts to train a worm to complete a simple maze in order to find out if worms can learn and remember.

Learn about sound physics and do a survey experiment to explore the difference between sound and noise in this science project.

This project determines whether hands-on practice, mental practice, or no practice leads to better shooting of free-throws.

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

Check out this fun science fair project idea to explore the process of diffusion in a cell and learn the difference between osmosis and diffusion.

This science fair project examines how carnivorous plants digest insects, and whether the plant can use nitrogen in the soil to compensate for lack of insects.

This science fair project idea determines which flower lasts the longest.

In this activity, your child will be challenged to create a device that protects an egg when it is dropped from a height of about 10 feet.

Collect meteorite dust with a magnet in your very own backyard! The objective of this science fair project is to gather meteorite dust to study outer space.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

This experiment will investigate whether reward or punishment is more apt to motivate people.

The goal of this science fair project is to attempt to build a perpetual motion machine and analyze the Laws of Thermodynamics.

This science fair project examines the vein structure (venation) of leaves in order to determine the class of the plant sample.

In this science project, learn about water transport in plants and make a beautiful dyed floral arrangement with cohesion, adhesion, and xylem tubes!

Explore the concept of receptive fields and why different parts of our body have different levels of sensitivity.

In this hands-on design challenge your child will make their very own Rube Goldberg Machine.

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 goal of this science fair project was to examine how different angles of decline affect the tipping point of a vehicle.

This project concerns activity happening millions of miles away, on the sun.

Start your toy engines -- this is going to be a fast and friction-filled race!

What chromosome combinations determine a fetus gender? Use probability to think about whether a sperm and ovum will create a male or female in this project.

Check out this fun science fair project idea to learn about seismic waves and how fast they travel during an earthquake.