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

This science fair project compares the allelopathic affects of juglone, a chemical agent produced by the Black Walnut tree, on two plants.

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

Show your fifth grade scientist how to create a siphon using two buckets, plastic tubing, and water. Watch her astonishment as the water travels uphill!

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

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

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.

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.

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

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

In this microwave plant experiment, find out whether microwave radiation will affect radish seed germination. Will it help or hinder the plants' growth?

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

This science fair project idea measures the growth of bread dough and finds out how long it takes for the dough to stop rising.

Demonstrate how static electricity can cause an object to move. It also examines just how an object affected by static electricity will move.

Kids will learn some cool stuff about chemical reactions by determining what happens when you mix different concentrations of hydrogen peroxide and yeast.

The objective of this science fair project is to analyze the effects of salinity and temperature on water.

Have you ever seen fruit decay? Find out if a fruit will rot faster if you open it versus leaving it untouched!

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

Believe it or not, the common spud has enough electrochemical energy to power a small digital clock.

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

Observe corn seed germination to learn about dicots and monocots and how plants grow from seeds to seedlings to full-grown plants!

Show your child that the simplest ingredients (salt and water) can be used to illustrate the concept of density!

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

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

This science fair project idea explores substances that cause a bubble to last longer.

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

Inspire your child to put on her engineer hat for the day, as she builds her very own, double-decker bridge.

Making your own glass cleaner is easy, effective and inexpensive!

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

This science fair project idea provides evidence that air is everywhere and takes up space.