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In this cool experiment, learn how to find specific gravity of minerals using liquids of different densities to see which substances and items sink and float.

In this experiment, your child will create two compost bins and see if he can determine what attracts fruit flies.

This science fair project idea highlights decomposition rates by comparing how long it takes an item to decompose in a compost pile vs. a landfill.

How powerful is the reaction between baking soda and vinegar? Find out here!

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

This science fair project investigates why the number of visible stars changes from place to place.

What keeps a an item cooler, polymer crystals or ice? Find out in this cool science experiment!

Wind is an important source of renewable, green energy. The purpose of this science fair project is to build and operate a windmill generator.

This science fair project examines which fruits and/or vegetables will ripen prematurely when placed with ripe apples.

This science fair project on testing water hardness is a great introduction to practical chemistry. Test and learn the difference between hard and soft water.

This science fair project idea discovers whether there are some objects that do not fall at a constant rate.

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 investigates how the height at which a pendulum is released affects the length of time it continues.

Find the North Star, and measure your latitude! The purpose of this science fair project is to find latitude and learn about geographic locations.

Be a chemist for a day and study the simple reaction between sugar and heat. Try heating sugar and see what happens!

Teach kids about a fun way they can remember this more efficiently- the power of mnemonics. Kids will be amazed.

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

In this science project, learn about water transport in plants and make a beautiful dyed floral arrangement with cohesion, adhesion, and xylem tubes!

In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

In this fun science fair project idea, kids will experiment with various methods in order to discover the fastest way to cool a soda.

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.

Do hand soaps and sanitizers prevent the growth of bread mold? If so, why? Kids will find out with this fun and informative science fair project idea.

Saturn is the ringed planet in our solar system, a gas giant with rings made of ice and dust. Let's make a cool scale model with an old CD and some glitter!

Kids build a desert food chain, desert food web, and desert food pyramid in this cool science fair project to learn about trophic levels and consumers.

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

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

Is it magic? No...it's the amazing, gravity-defying capillary action experiment! Kids will love this dramatic and enlightening science fair project.

Did you know a mouse eats almost fifty times as much as a cow? Find out how and test out the strange science with your friends!

Science fair project which determines whether plants are able to get enough nutrients from different types of garbage.

The objective of this science fair project is to test the growth rate of a plan in a crystal medium in comparison to traditional soil.