This science fair project compares the allelopathic affects of juglone, a chemical agent produced by the Black Walnut tree, on two plants.

Do you think heat can affect a plant's growth rate?

Do dogs understand English? Kids will find out with one of our favorite dog science fair projects that tests how dogs process human language and other cues.

Test your friends to find out if you can replicate the placebo effect's incredible results.

Learn how different types of soil affect how animal tracks form in this experiment!

What kind of fabric holds dye best? How can you improve a dyed fabric's colorfastness? In this colorful project, test colorfastness using mordants and bleach.

Learn about the horizontal and vertical motion of a projectile in this cool physics science fair project idea for advanced middle and high school students.

Explore the relationship between personality traits and birth order effects.

Learn about the fruit fly life cycle in this experiment. Capture fruit flies to examine various stages of insect metamorphosis.

This project examines the concentration of dissolved oxygen in water, with and without oil.

Why does honey crystallize? This science fair project project answers this question and identifies the variable that makes this sweet solute crystallize faster.

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

Is there any correlation between hot tubs and high blood pressure? Kids discover the answer (and its biological basis) in this cool science fair project.

This science project teaches young students about germs, bacteria, and the importance of washing their hands. Students will test what is the best way to wash.

This science experiment tests if dog saliva can really help heal wounds.

This science fair project determines what effect substances have on ice, and which of these products most effectively melts ice.

Kids learn how to make a simple electric motor in this great engineering science fair project that teaches them how current generates its own magnetic field.

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.

In this science fair project, students will try to discover if test subjects can detect the presence of Monosodium Glutumate (MSG) in food.

Want to see a great example of Newton's first law? Kids will learn about basic physics with this fun, ballistic experiment.

Kids conduct a cool balloon rocket experiment in this fun science fair project idea. Does a greater volume of air mean a greater distance traveled?

The scientific purpose of this experiment is to investigate which material is the best packaging for fragile items during shipping.

Water, along with soil and light, is a necessary component for plant growth. So what's better for promoting plant growth: tap water, or rain water?

Brine shrimp usually live in saltwater. Investigate how salt concentration (salinity) affects the rate at which brine shrimp eggs hatch.

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

This science experiment tests why guacamole goes brown and if leaving the pit in will stop guacamole from turning brown.

This project examines the affect of temperature on viscosity and surface tension of different liquids.

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

How good are humans at sound localization? Kids can try this cool science fair project idea to see how good their friends are at judging sound direction.