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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.

Start your toy engines -- this is going to be a fast and friction-filled race!

This project examines what types of objects burn and which burn faster and cleaner.

Did you ever add salt to pasta? Did it help cook the pasta faster? If not, find out in this science fair project idea.

What is elasticity? Students will investigate how this concept applies to bouncing ball physics by testing the bounces of balls made out of different materials.

This science fair project idea explores whether color affects a person's emotional state.

Play with balance and simple engineering as you hurry to create a sturdy rock tower.

What's the relationship between temperature, air humidity and static electricity? Kids will find out with this free static electricity science fair project.

Kids will build a turtle habitat in order to observe the climate preferences of this cold-blooded reptile.

Ant behavior is closely related to light intensity. This free science fair project idea examines how fast ants dig when they are exposed to to light and dark.

This science fair project idea recreates the movement of planetary bodies in order to learn why they sometimes appear to move backwards.

Science fair project that determines whether landscaping fabric impacts the ability of plants to receive water.

Science fair project which evaluates different athletic shoes in order to find out whether any of them affect a person's ability to run.

This science fair project idea explores whether it is easier to balance on a narrow ledge or on a rope.

What can you do with hair after its cut? This science project teaches you practical uses for human hair.

Learn whether writing things down really makes things easier to remember.

Crayons aren't just good for creating colorful masterpieces -- they're also great for science!

This science fair project idea explores substances that cause a bubble to last longer.

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

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

Is there a relationship between caffeine and heart rate? Students will determine the effect of caffeine on heart rate in this fun science fair project.

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.

Examine which metal conducts more heat by boiling water in 3 pans made of aluminum, copper, and stainless steel.

This science fair project idea produces varying pitches of sound.

What heats up fasterâwater or soil? 5th grade students test the specific heat of water against the specific heat of sand in this great science fair project.

Learn how to be a bird scientist in this simple project of watching feathered friends in their habitat.

Discover flight initiation distance as you play around in the park with this fun bird watching project!

This science fair project idea investigates if webbed feet help a duck (and others) swim.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

Can you dig it? This science experiment isn't for kids who like to keep their hands clean.