This science project challenges students to learn about and classify weeds and discover new practical uses for weeds.

This science project teaches students to classify different shapes of leaves.

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!

Could there be toxic chemicals lurking in the cupboards and closets of your home?

This project examines if computer screen and text color affect retention and if people subconsciously prefer combinations of colors that help their retention.

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

This science fair idea project identifies the active ingredients in soap and experiments with the properties of soap.

In this cool science fair project idea, kids conduct the ruler drop test on volunteers to determine whether reaction time can be improved with practice.

Science fair project about work and energy which uses a simple mathematical formula to predict how far a jar will roll down an incline.

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 project has students collect wood samples and invent new uses for different types of wood based on its properties.

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.

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.

What combination of cloth and stain will be the easiest for removing stains? Test and experiment!

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.

In this experiment, you'll make a seafloor spreading model to learn more about how plate tectonics work and create mid-ocean ridges.

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

This science fair project idea determines which method of hand cleansing is the most effective.

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.