This science project uses Mohsâ Hardness Test to show kids how to compare the hardness of different types of minerals.

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

This science fair project idea determines what household items are good conductors of electricity.

With this science fair idea, little scientists will gain valuable insights into the physics behind throwing a baseball.

This science fair project idea demonstrates that light travels in straight lines and experiments with reflecting light.

This science experiment has students test whether a snail moves faster on concrete or dirt.

The goal of this science fair project is to analyze differences between the taste and texture of frozen and fresh food.

This science fair project on testing water hardness is a great introduction to practical chemistry. Test and learn the difference between hard and soft water.

Prove that the Earth is not flat. The objective of this science fair project is to measure the angle of the sun and calculate the circumference of the Earth.

This science fair project will help students learn about non-vascular plants, such as mosses.

In this science fair project, learn how a mineral streak is made and how it can help identify an unknown mineral.

The purpose of this science fair project is to study the properties of sugar and examine individual preferences for sugar and other sweeteners.

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.

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.

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

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.

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

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