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

This science fair project idea investigates how the height at which a pendulum is released affects the length of time it continues.

This cool science fair project teaches kids about temperature, density and buoyancy using balloons that float with normal air. No helium required!

In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

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.

Help your second grader observe the phases of the moon, and then let the fun loose: he'll get to chart his observations with marshmallows!

Throughout history, people have used song as a teaching and memory tool. This project explores whether song improves a person's ability to retain information.

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.

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

Kids will learn how to make a thermometer to to explore liquid density in this great science fair project. Which liquids are affected by temperature the most?

Do you think heat can affect a plant's growth rate?

By incorporating natural materials and the powers of observation, your child will become a backyard naturalist while building early writing and drawing skills!

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

While your cells are much too small to see without a microscope, you can create the look of a cell in your very own home with just an egg and vinegar!

Kids will learn how to make a steam powered rocket boat, also called a putt putt boat or a pop pop boat, in this great science fair project for 4th graders.

The goal of this project is to create an exciting topographical map out of dough.

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

The objective of this science fair project is to explore the relationship between acidic and basic compounds.

Explore how sound waves are reflected and absorbed by producing echoes. Analyze which locations produce echoes.

Have you ever noticed the ridges on a dog's nose? In this project, we take several dogs' nose prints and discover just how unique they are!

Is it a square or a circle? See if you can trick your friends with this zany science project!

In this science fair project, kids will be able to see where germs reside on their hands while gaining insight into the benefits of thorough hand washing.

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

Discover that the absorbency of fabrics depend largely on the shape and structure of the individual fibers that make up the fabric.

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.

What is persistence of vision? With this hands-on science fair project idea, students will demonstrate this cool and dramatic phenomenon in their own classroom.

Kids will learn about the interaction of lactose and lactase in milk and discover why we describe enzymes as catalysts in this fun science fair project.

In this exciting and empowering challenge, your child will construct a bridge using marshmallows and toothpicks!

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

In this activity, your child will be asked to create a boat that can successfully float while holding 25 pennies.