Kids learn how to prevent erosion by growing grass. They'll test soil with grass against raw soil in this revealing science fair project idea for 4th grade.

This science fair project uses paper chromatography to investigate whether black, brown, orange, and purple are pure colors or mixtures of other colors.

Find out whether soil amendments can improve soil conditions and help you grow a bigger beanstalk in this ecology experiment!

This science fair project idea investigates the hardness property of minerals.

In this cool experiment, learn how to find specific gravity of minerals using liquids of different densities to see which substances and items sink and float.

This science fair project idea investigates if fats add to the flavor of food.

Magnets vary in strength. Have your young scientist figure out which kind of magnet is the strongest when you have him conduct this attractive experiment.

This science fair project idea examines the reason boats are shaped and engineered.

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

Do lefties just write different or are their brains different? This science project has students explore what it means to be left handed.

In this activity, your student will be invited to build a chair out of building blocks that is designed to meet the specific size and shape of a small doll or toy figure.

Is it amplitude? Weight? Length of string? Kids will discover what factors changing the period of a pendulum depends on in this fun and easy physics experiment.

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.

In this science fair project, kids observe the expansion of liquids when frozen and determine if some liquids expand more than others in the freezing process.

Learn whether writing things down really makes things easier to remember.

This science fair project examines how tsunamis travel by simulating a tsunami moving around an island. You will generate a pretend tsunami in a swimming pool.

This classic children's game demonstrates how sound travels through air vs. through a solid.

In this science fair project, students focus sunlight with a magnifying glass and trap shorter waves to melt ice.

Gymnosperms are coniferous trees that reproduces using pine cones to spread seeds. Check out this simple pine cone experiment to learn about the process!

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

Science fair project idea which teaches you how to make butter by separating cream into butter and buttermilk.

In this simple circular motion experiment, you'll observe tangential velocity and learn about how acceleration and centripetal force affect an object.

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!

This activity challenges students to use computational thinking as they create a sequence of commands that will make a robot navigate around several obstacles.

Science fair project about work and energy which uses a simple mathematical formula to predict how far a jar will roll down an incline.

Science fair project that compares the biodiversity of fungi in different ecosystems by identifying species of fungi.

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

Find out whether packaged seeds actually do expire in this new science fair project idea.

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

This science fair project idea studies which brand of wintergreen candy produces the most sparks in the dark.