Did you know your body is full of simple machines? This project looks at one of the third-class levers in the human body: your arm!

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

This project compares the strength of one, two, and three-ply toilet paper.

In this investigation, three different juices are tested to determine which juice contains the greatest amount of vitamin C.

Examine which metal conducts more heat by boiling water in 3 pans made of aluminum, copper, and stainless steel.

In this cool project, create a lighted, scale model of the different layers of the Sun, including the core, radiation and convection zones, and photosphere.

In this open-ended activity, students will be given a small quantity of three types of materials and asked to design a prototype for “something that will improve the school.”

Explore the craters, maria, and highlands on the surface of the Moon! In this fun science project you'll create a 3-D model of the moon using paper mache.

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.

Experiment with buoyancy to learn how a submarine rises and sinks in this classic science experiment.

Alive or not? This yeast experiment you can conduct with your little scientist explores the answer to this timeless question.

The purpose of this science fair project is to demonstrate how yeast, a fungus, causes bread to rise.

Is it a square or a circle? See if you can trick your friends with this zany science project!

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

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

Blend art and science in this hands-on activity that shows your kindergartener how primary colors combine to make secondary colors.

Do you love to make Jell-O? Find out in this science fair project idea if it is possible to make Jell-O with just warm water.

What cause the phases of the moon? Make a model to see how the positions of the Sun, Moon, and Earth cause the crescent, gibbous, quarter, full, and new moon.

When you cut a flower to put into a vase, it'll eventually wilt, even with water and sunshine. But is there another scientific secret to keeping flowers fresh?

This science fair project idea investigates whether plants can survive being frozen.

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

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

In this science fair project, students focus sunlight with a magnifying glass and trap shorter waves to melt ice.

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

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

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

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

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

The project investigates how water and movement affects erosion.