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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.

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!

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!

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

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 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.

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.

How does the size of a vibrating surface affect the pitch of a drum? Learn about drum size and pitch with this easy science fair project idea.

It's rhyme time! With this science fair project idea, your child will find out which words can be considered easy rhyming words, and why.

This science experiment has students test whether a snail moves faster on concrete or dirt.

This science fair project idea teaches how the gases and pollution in the air affect the earth's atmosphere temperature.

This classic children's game demonstrates how sound travels through air vs. through a solid.

This project determines what category of person is most likely to be ticklish.

Did you even wonder why some rocks are round and smooth while others are broken up into small pieces?

This science project teaches young students about germs, bacteria, and the importance of washing their hands. Students will test what is the best way to wash.

What do ants eat? Kids find out by observing a colony of ants in this cool zoology science fair project for 4th grade.