This project determines the age of a tree using a growth factor chart instead of cutting the tree down to count the rings in its base.

Science fair project that helps you better understand density by comparing the relative densities of cans of Coke and Diet Coke.

Science fair project that examines how yeast grows, and which conditions allow for optimal growth. What types of nutrients does yeast prefer?

In this experiment, young ecologists will learn about a type of edge effect: how trees and plants at the edge of a forest can act as a weed filter.

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

In this cool physics experiment, use double plane mirrors at various angles to learn about light reflection. Then, see if you can solve a puzzling problem!

This science fair project idea explores whether people have an innate feel for the passing of time from a few seconds to 20 minutes.

This science fair project idea explores whether talking to a plant will help it grow.

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

Science fair project which teaches you about the principles of physics within a vacuum by creating a vacuum chamber.

This project examines whether people's taste perception is influenced by what they see.

Science fair project which identifies the most effective insulator that you could use to make a winter coat by comparing how well cloth and cotton trap heat.

This science fair project idea creates a sedimentary rock and to investigate what takes place during the rock cycle.

What is biodiversity? Kids will study different areas of their backyards to see which is the most diverse to learn about biodiversity and random sampling.

Learn how to make a hygrometer to measure relative humidity in this project. Make a sling psychrometer hygrometer with gauze, thermometers, and a bottle.

Is there a relationship between caffeine and heart rate? Students will determine the effect of caffeine on heart rate in this fun science fair project.

This science fair project idea develops an understanding through experimentation of which shapes are the most structurally strong.

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

What are buttress roots? In this fun science project, make a model of a rainforest tree and learn how they help trees survive in the tropical rainforest!

This science fair project idea compares biodiversity between drops of water.

This cool and easy elementary school science fair project idea provides the basic information on the use of our senses to experience the world about us.

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

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.

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

What are the effects of fertilizer on plant growth? What's the best fertilizer type (solid, liquid or powder)? Kids find out in this science fair project idea.

Stories change as you retell them. The objective of this science fair project is to demonstrate how information gets interpreted, distorted and changed.

Science fair project that teaches you about chemical indicators and how to make your own in order to identify various mystery solutions.

This science fair project idea produces varying pitches of sound.

In this fun project, use a memory game to test various age groups and determine whether aging directly affects short-term memory loss.

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