This science fair project idea determines the most effective method of preserving food.

This science fair project idea investigates the difference in reaction times between boys and girls.

Tree rings can tell the age of the tree but also information about the world. This science experiment uses tree stumps to discover new facts.

Did you ever add salt to pasta? Did it help cook the pasta faster? If not, find out in this science fair project idea.

Check out this cool science fair project on identifying rocks and minerals for kids.

What is condensation? Little mad scientists will learn about condensation, states of matter, and air pressure by conducting this cool science experiment.

How sensitive is your skin? Here's a fourth grade science experiment that lets your child figure it out.

This science project allows students to study the psychology of happiness.

This science fair project idea explores whether boiling and freezing water will have an effect on how much it weighs.

This science fair project teaches students the differences between fruits and vegetables.

Make water and clay play a little more scientific with this hands-on experiment that teaches displacement and shows how an object's shape affects its buoyancy.

Total alkalinity and pH personal care products are controlled to prevent skin irritation. Learn more about basic and acidic substances in this science project.

This science project challenges students to learn about and classify weeds and discover new practical uses for weeds.

Discover whether cold or hot water from the faucet will boil faster on the stove.

How greasy are your potato chips? Students will use a reliable method to quantify greasiness and compare different brands in this great science fair project.

Get your hands on a concoction that breaks the rules about what's a solid and what's a liquid.

Amaze your kids by separating a salt and pepper mixture using an "electric spoon" charged with wool.

How good are humans at sound localization? Kids can try this cool science fair project idea to see how good their friends are at judging sound direction.

Learn how to demagnetize a magnet and how physics can explain this phenomenon with this enlightening science fair project.

The objective this science fair project is to determine whether a bigger bag will allow a homemade hot air balloon to fly higher than smaller bag.

Discover which fabrics shrink the most in the wash and why.

Encourage your child to think outside the bathtub by making her very own handmade soaps! Perfect as a present, a decoration, or just to pamper herself.

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.

Science fair project in which you will examine how crystals are formed by creating your own crystal using charcoal briquettes, salt, and ammonia.

Use chemical analysis to identify a variety of mystery powders that look the same but actually have very different properties.

The objective of this science fair project is to set up a compost bin to convert food scraps and organic waste.

This science fair project idea examines the reason boats are shaped and engineered.

This science research project challenges students to think of more effective lobster farming methods.

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

This 4th of July, explore fourth grade science and make some safe fireworks in your own backyard using soda pop!