This science project challenges students to learn about and classify weeds and discover new practical uses for weeds.

Tired of gum with flavor that lasts for just a couple of minute? Put gum to the test with this chewy science experiment!

This is a quick, easy science fair project that conveys the idea of density to preschool and early elementary children.

Kids will learn how to make a thermometer to to explore liquid density in this great science fair project. Which liquids are affected by temperature the most?

Kids will make a beautiful rainbow in a jar and learn what enables different types of liquids to remain distinct in separate layers.

This project is a vivid, concrete introduction to the basic but important idea that plants need sunlight and water to grow.

In this experiment, students will create their own version of coquina, a sedimentary rock thatâs formed by seashells and sand, cemented by seawater minerals.

This science fair project idea builds models of various types of bridges and then determines which bridge design is the strongest.

Demonstrate the properties of pressure and surface tension to explain how water can stay inside an upside down glass using cardboard.

The objective of this science fair project is to study the photosynthesis process and demonstrate the important role that leaves play in the process.

In this science fair project, we learn how air molecules move as a result of density, convection, and air currents.

In this science fair project, students discover how sedimentary layers form as sediments like mud, silt and sand settle over time.

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.

Will potatoes spud or sprout faster in dry, dark, or cold conditions? Find out in this science fair project idea!

In this science experiment, do tensile strength test on fishing line, a strand of hair, a rubber band, and any other materials you're curious about!

What is vegetative reproduction? Find out how you can clone plants and regrow cabbage from a stem in this cool experiment!

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 project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

This science fair project idea experiments with spinning color wheels and optical illusions.

What's the relationship between temperature, air humidity and static electricity? Kids will find out with this free static electricity science fair project.

This science fair project explains the process of how the lungs expand and contract with the help of the diaphragm.

Students will investigate the thermal conductivity of metals by learning how to measure thermal conductivity with this fun and easy science fair project idea.

Find out which type of sponge holds the most water.

This science fair project idea investigates emulsifiers that allow oil and vinegar to mix.

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

Kids will learn how to make a steam powered rocket boat, also called a putt putt boat or a pop pop boat, in this great science fair project for 4th graders.

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

This middle school science fair project determines whether DNA is most easily extracted from under-ripe, ripe, or over-ripe strawberries.

This science fair project focuses on the use of a conductivity device that will determine if a substance dissolved in water can or cannot conduct electricity.

In this science fair project, students use the streak test to tell minerals apart from each other.