In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

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

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.

In this science fair project, students use the streak test to tell minerals apart from each other.

Find out whether putting something on top of a plant will inhibit its growth.

How would you dry your wet clothes if your dryer didn't work? Find out with this fun experiment!

Discover whether the â5-second ruleâ is effective at determining whether food is still safe to eat after being dropped on the ground.

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.

Would it hurt to skip brushing your teeth just this once? Let's find out by seeing which foods produce the most mouth bacteria.

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

Explore if planting seeds in a certain direction will affect how fast it germinates.

Want to see a great example of Newton's first law? Kids will learn about basic physics with this fun, ballistic experiment.

The project investigates the affect music has on plant growth while experimenting with rock, classical and no music.

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

How clean is the air we breathe? The answer might surprise you. Learn how to investigate local air quality with this cool science fair project.

Science fair project that examines condensation and the conditions needed in order for dew to form.

In this project, the affects of vitamin E are observed on a rose petal.

Science fair project which compares the rate of temperature change and the maximum temperature as a result of the angle of light radiation.

4th graders construct an ocean food web to learn about consumers and trophic levels, food webs, and food chains in this cool ecology science fair project.

This science fair project idea examines liquids of different densities.

In this project, vinegar and salt act as preservatives keeping bacteria from growing in the bouillon mixtures.

Science fair project which determines whether the size or the thickness of a piece of paper has an effect on how many times it can be folded in half.

The purpose of this science fair project is to study the properties of sugar and examine individual preferences for sugar and other sweeteners.

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

This science fair project idea examines whether boys and girls differ in reflexes.

Find out whether a longer airplane will fly farther or a wider paper airplane.

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

This science fair project idea explores whether the process used to dry the beans we eat for food renders them unviable.

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.

This is a fantastic and easy science experiment where kids will learn about elasticity by testing how high bouncy balls of different materials can bounce.