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Young scientists will investigate people's preferences for saltiness, and make some inferences about genetics and diet.

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

This science fair project idea explores how the shape of a boat affects its density and how much weight it can float.

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

Learn about this simple machine and make a pulley of your own to use for fun science trials.

The goal of this science fair experiment is to demonstrate the effects of air pressure on objects and analyze applications of air pressure principles.

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

Step into the fantastic world of colors with a project that explores what shade you -- and your friends -- like best.

Gather some friends for a bubbly soda taste test do determine calories' role in your favorite drinks.

Find out whether soil amendments can improve soil conditions and help you grow a bigger beanstalk in this ecology experiment!

This science fair project idea examines whether adding gelatin causes a solid to have a higher melting point and/or melt slower.

This science fair project idea explores whether talking to a plant will help it grow.

Here is a fun middle school science project on factors affecting solubility. Learn how dissolved solids can "crash out" to form crystals when conditions change.

Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

In this project, you'll build a model of the earth, complete with all seven continents and four major oceans.

Science fair project that examines how winter storms form and the relationship between temperature, moisture and snow.

What causes dilated pupils? Young scientists will find out by applying what they already know about changes in pupil size and making models of the pupil.

This science fair project idea determines what household items are good conductors of electricity.

What's the science behind those out-of-sight roots? Find out if you can trick roots into growing in different directions.

What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.

In this plastic wrap science fair project, you'll learn about polymer permeability and find out which plastic wrap keeps food from dehydrating best.

In this enlightening transpiration experiment, kids will explore how the loss of water from plants through transpiration contributes to the water cycle.

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.

In this simple circular motion experiment, you'll observe tangential velocity and learn about how acceleration and centripetal force affect an object.

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

How do icicles form and what do they look like? Do this free science fair project and watch the formation of icicles occur right before your eyes.

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

This science experiment tests why guacamole goes brown and if leaving the pit in will stop guacamole from turning brown.

In this project, build an insect model that shows how the head, thorax, and abdomen fit together! Learn insect anatomy by constructing a paper mache critter.

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