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Air invisible; it doesn't make sounds; you can't pick it up and throw it. So how do we know it exists? Help your second grade scientist figure it out.

Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

What's the science behind those out-of-sight roots? Find out if you can trick roots into growing in different directions.

Did you know a mouse eats almost fifty times as much as a cow? Find out how and test out the strange science with your friends!

What is a wedge? Kids find out by experimenting with different wedges in this simple science fair project idea.

How powerful is the reaction between baking soda and vinegar? Find out here!

Do different types of oil mix or stack? Find out in this science fair project idea!

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

Test your friends to find out if you can replicate the placebo effect's incredible results.

What keeps a an item cooler, polymer crystals or ice? Find out in this cool science experiment!

In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.

Do earthworms like moisture or darkness? Find out as we explore the relationship between earthworms and light.

Are you ready to be a detective for science? Then get out your magnifying glass and start studying fingerprints!

Have you ever wondered how many numbers most people can memorize? Test your friends to find out!

Enter the buzz worthy world of bee watching and find out what time bees like to wake up!

When you see those sunscreen "protection levels," what does that really mean? Try this experiment to find out.

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

Will storing cucumbers and tomatoes in the fridge destroy their unique flavors? Find out in this science fair project idea!

Here's an interesting activity that will enable your child to make his own magnifier out of a drop of water

In this activity, your learner will be challenged to create their own tic-tac-toe grid out of building blocks.

How does salinity affect the point at which water freezes? Kids will find out by performing this cool melting ice experiment.

In this fun design challenge, your child will get creative with making structures out of toothpicks and gumdrop candies.

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.

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

What is a compound microscope? Kids find out by making one of their own in this cool science fair project.

What is topography? Kids find out by learning to make and read a topographic map in this awesome science fair project idea.

Check out this cool science project idea to learn about rocks and explore the cycles of formation, breakdown, and reformation of rocks in the Earth's crust.

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

Who knew that you could make beads out of rose petals? Not only can it be done, but the beads smell wonderful!

In this science fair project, we'll use a liquid crystal thermometer to find out whether exercising makes a difference in people's temperature.