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

This science fair project compares the allelopathic affects of juglone, a chemical agent produced by the Black Walnut tree, on two plants.

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

Show your fifth grade scientist how to create a siphon using two buckets, plastic tubing, and water. Watch her astonishment as the water travels uphill!

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

In this science fair project, students will create a model of a shoreline, observe erosion and examine how jetties prevent erosion.

How do series and parallel circuits work, and which produces the brightest light in a light bulb? Construct both in this project and find out!

This science fair project explains the process of how the lungs expand and contract with the help of the diaphragm.

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

This science fair project idea builds models of various types of bridges and then determines which bridge design is the strongest.

An hour glass, also known as a sand clock, keeps time. In this activity, your child will make her own sand clock and measure the time it keeps.

Here is a cool and easy science project to determine the rate of chlorophyll breaks down and how it affects the color change of grass from green to yellow.

In this science fair project, students make their own rain gauge to measure rainfall.

Help your child create a magical miniature garden in the most unlikely of places: a recycled plastic bottle!

Science isn't ho hum anymore when it involves building catapults to teach your fifth grader about projectile motion.

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

This science fair project idea researches the different layers of the atmosphere and creates a visual representation of the atmospheric layers.

Help your child create a working lung model that fills with air just like the lungs inside of his own chest when he breathes.

Have your kid determine if a goldfish can be conditioned to expect food the same way Pavlov's dogs did with this fascinating science fair project.

With a clear bottle and a few plastic straws, you can easily make a hummingbird feeder and demonstrate the effects of atmospheric pressure at the same time!

Create a soda bottle garden that defies gravity! This hanging terrarium is housed in a soda bottle and perfect for crafty kids with a growing green thumb.

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

Observe corn seed germination to learn about dicots and monocots and how plants grow from seeds to seedlings to full-grown plants!

In this science fair project, students discover how sedimentary layers form as sediments like mud, silt and sand settle over time.

Use simple items to create a kindergarten "grow box" that lets a kid see just how salad plants send down their roots and grow underground.

This simple "how to make a water wheel" activity makes physics come alive for your child by demonstrating how different kinds of energy work.

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.

This science fair project idea investigates which objects float and sink in honey, water, and oil.

This science project teaches students the relationship between compost and plant growth. Students conduct an experiment with different types of compost.

Science fair project which measures whether tsunamis are more destructive when they are caused by an earthquake or by a meteor.