Is it amplitude? Weight? Length of string? Kids will discover what factors changing the period of a pendulum depends on in this fun and easy physics experiment.

The purpose of this science fair project is to explore whether UV light passes through some colors and not others by looking at blue, red, purple, and clear.

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

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.

Science fair project that determines whether cooling eggs helps them be peeled more easily. Compare the time it took to peel each egg.

Learn whether Mylar Balloons last longer than Latex Balloons or vice versa.

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.

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

Science fair project which determines if plants really do need water to grow, or whether they just need to be kept wet.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

Observe how your brain works while it is focused on one thing, and how it works while you are distracted by another thing.

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

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.

Science fair project that examines how to grow bacteria in a controlled setting, using simple materials from around the home.

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.

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

In this science fair project, students examine under what conditions individual plants release seeds and how far the seeds are released.

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

In this science fair project, apply the principles of leverage and force by building six simple machines designed to set weights in motion.

Learn about the fruit fly life cycle in this experiment. Capture fruit flies to examine various stages of insect metamorphosis.

Ever wondered how a plant drinks water? This science project will teach you how and help you create a beautiful floral display!

This science fair project idea investigates the difference in reaction times between boys and girls.

The goal of this science fair project is to analyze differences between the taste and texture of frozen and fresh food.

This science fair project on testing water hardness is a great introduction to practical chemistry. Test and learn the difference between hard and soft water.

This science fair project idea explores plant growth from a bulb, root, and a stem and investigates asexual plant reproduction.

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

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

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.

Does skin thickness really decrease fruit spoilage? Find out in this science fair project idea!