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.

In this cool science experiment, learn about magnetism and poles, and test magnet strength to find out if two magnets are twice as strong as one.

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

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

This project compares the strength of one, two, and three-ply toilet paper.

Teach your little scientist about the amazing powers of gravity by comparing the falling speeds of two yummy fruits

This homemade barometer allows your little scientist to contemplate and compare different air and weather conditions.

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

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.

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

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.

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

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

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

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!

Enjoy those warm spring and summer nights with your child while teaching some basic astronomy at the same time.

Unlike other seed sprouting projects, this one allows kids to compare five different sprouts (either 5 herbs or 5 flowers) by watching them grow in a glove.

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.

In this activity, students will think about the form and function of household objects as they compare and contrast kitchen serving spoons of various sizes and designs.

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.

How greasy are your potato chips? Students will use a reliable method to quantify greasiness and compare different brands in this great science fair project.

This science fair project idea teaches that time always passes at the same rate and nothing we do in our daily life âreallyâ affects how fast it moves.

Milk is made of water and fat; but how can you separate the two? Find out in this color changing milk experiment.

In this experiment, your child will create two compost bins and see if he can determine what attracts fruit flies.

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

In this science fair project, young children discover what happens when two fluids that have different densities get together.

Is it solid or liquid? Create oobleck and witness the amazingly weird oscillation between the two!

Show your fifth grade scientist how to create a siphon using two buckets, plastic tubing, and water. Watch her astonishment as the water travels uphill!