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

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

The project determines which laundry detergent is best for cleaning clothes.

Have your kid determine if a goldfish can be conditioned to expect food the same way Pavlov's dogs did with this fascinating science fair project.

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

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

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.

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 project examines absorbent polymers absorbency in disposable diapers and their unique ecological problem to the environment.

This science fair project idea is develops new or improved paper making techniques and encourages recycling.

Discover how to make fake snot with this cool science fair project idea to learn about polymers, enzymes, and more.

This science fair project idea produces varying pitches of sound.

This science project encourages students to investigate the Mozart Effect, the idea that classical music promotes learning.

This science fair project teaches kids experimental design and how to test if subjects can really sense if they are being watched.

In this project students experiment with making music using only glasses of water.

Test whether plants can grow without sunlight and water.

This science fair project idea examines liquids of different densities.

This science fair project idea researches the effects of acid rain on plant growth.

This science fair project idea investigates if fats add to the flavor of food.

What animals are most popular? This project affords practice in data-collection, record-keeping and data-analysis through the investigation of this question.

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

Compare animal and plant fats and observe, and record, and draw conclusions about their similarities and differences.

This science fair project idea investigates the ability of different whitening toothpastes to whiten teeth.

Prove that the Earth is not flat. The objective of this science fair project is to measure the angle of the sun and calculate the circumference of the Earth.

In this experiment we will be determining whether birds prefer certain colors of seed.

In this science fair project, kids start a chemical reaction that will make a balloon inflate itself!

This science fair project idea identifies the properties of soap bubbles and invents a new or improved bubble solution.

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

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.

The goal of this project is to create an exciting topographical map out of dough.