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

Invite your fifth grader to test the different rates of liquid absorption in synthetic and cotton materials, such as nylon and cotton.

Science fair project that determines whether mass and weight are the same or different.

In this science fair project, students learn how pressure can make the minerals in a rock line up in the same direction and form bands and foliation.

Use chemical analysis to identify a variety of mystery powders that look the same but actually have very different properties.

This science fair project idea explores whether cats can be trained in the same way that dogs can.

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

Demonstrate how you can make your own compass using a magnetized needle. It also allows you to compare magnetic north and geographic north.

Have your kid determine if a goldfish can be conditioned to expect food the same way Pavlov's dogs did with this fascinating science fair project.

This science fair project idea discovers if an artificial light source will yield the same plant health and growth rates as light from the sun.

Science fair project that determines whether cooling eggs helps them be peeled more easily. Compare the time it took to peel each egg.

In this activity, your child will make her own "quicksand" to better understand how a substance can be both fluid and solid at the same time.

With a clear bottle and a few plastic straws, you can easily make a hummingbird feeder and demonstrate the effects of atmospheric pressure at the same time!

Check out this science project idea to compare organic produce to non-organic produce and how preservatives in food extend the shelf life of goods.

In this project, waves of vibrations are experimented with using water in glasses.

Kids learn about potential energy, and mechanical energy, and how to make power from water with one of our favorite renewable energy projects for kids.

This science fair project idea determines if family members can recognize one another using only the sense of smell.

Science fair project which tests various sedimentary, igneous and metamorphic rocks to find out whether one rock family is stronger than the others.

Find out whether a longer airplane will fly farther or a wider paper airplane.

The goal of this science fair project is to discover the science behind carbonated soft drinks and apply this knowledge to create a new one.

Does electricity move better through thick wires or thin ones? kids will conduct this classic electricity experiment for this science fair project.

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

Science fair project which compares the rate of temperature change and the maximum temperature as a result of the angle of light radiation.

This project explores whether nails, toothpicks, straws, or pen nibs are best for applying ink to paper.

This science fair project idea compares biodiversity between drops of water.

Science fair project that helps you better understand density by comparing the relative densities of cans of Coke and Diet Coke.

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

Science fair project that compares the ecology of different soil samples by identifying which sample has the most invertebrates living in it.

Science fair project that compares the freezing temperature of salt water and freshwater in order to learn about supercooling and condensation nuclei.

This science fair project idea measures and compares effects of chemical weathering, specifically carbonation, on different kinds of rocks.