This science fair project investigates whether tapping the top or the side of the can will stop a vigorously-shaken can of soda from exploding.

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 fair project idea examines whether plants are still able to grow normally if they are turned upside-down.

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

Discover how and which salt melts ice the quickest.

In this project, the fingerprints of family members are compared to determine if people from the same family have similar fingerprints.

This science fair project idea investigates how a bottom keel helps keep a boat from rocking back and forth.

This science fair project idea is develops new or improved paper making techniques and encourages recycling.

Discover whether a metal will expand under hot water.

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

This science project idea examines the effect of microwaving on various objects.

This science fair project idea produces varying pitches of sound.

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

In this project, a model of a submarine is built to simulate the buoyancy and displacement of water and air.

Want to see a great example of Newton's first law? Kids will learn about basic physics with this fun, ballistic experiment.

This science fair project idea explores if the length of the string that an object is suspended on has an effect on how fast or slow it swings.

Science fair project in which you will learn more about the natural world by preserving and identifying different animal tracks.

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

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.

In this simple science project, learn about what causes dew and what affects dew formation with a drinking glass, ice, and a soda bottle.

In this CD hovercraft science project, students will construct their own DIY hovercraft.

This science fair project idea explores how enzyme inhibitors, active sites, non-competitive enzyme inhibitors, and substrates work.

Would it hurt to skip brushing your teeth just this once? Let's find out by seeing which foods produce the most mouth bacteria.

What animals are most popular? This project affords practice in data-collection, record-keeping and data-analysis through the investigation of this question.

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

This science fair project demonstrates the magic of arches by challenging students to stack telephone books on top of eggs without breaking them.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

What does a raindrop look like when it splashes on the ground? Is each raindrop unique like snowflakes? Find out how raindrop size varies in this experiment.

How clean is the air we breathe? The answer might surprise you. Learn how to investigate local air quality with this cool science fair project.

This science fair project idea explores plant growth from a bulb, root, and a stem and investigates asexual plant reproduction.