Is cleaning with lemon effective? Get ready to give this science project some elbow grease and find out if acidic lemons can be used as a cleaning agent.

What is elasticity? Students will investigate how this concept applies to bouncing ball physics by testing the bounces of balls made out of different materials.

In this science fair project, kids measure how weather conditions affect how fast a puddle evaporates.

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

Science fair project which tests various sedimentary, igneous and metamorphic rocks to find out whether one rock family is stronger than the others.

Build a 3d animal cell model with this cool science fair project, which helps kids visualize and understand the function of a cell's parts and organelles.

In this fun science fair project idea, kids will experiment with various methods in order to discover the fastest way to cool a soda.

This science fair project creates a visual model of whatâs happening to sound waves as a car approaches and then leaves.

What chromosome combinations determine a fetus gender? Use probability to think about whether a sperm and ovum will create a male or female in this project.

This is a fantastic and easy science experiment where kids will learn about elasticity by testing how high bouncy balls of different materials can bounce.

This science fair project idea investigates how a bottom keel helps keep a boat from rocking back and forth.

This science experiment tests if dog saliva can really help heal wounds.

Throughout history, people have used song as a teaching and memory tool. This project explores whether song improves a person's ability to retain information.

In this classic Ivory soap experiment, kids learn what happens to different types of soap in the microwave, and why!

This science fair project uses paper chromatography to investigate whether black, brown, orange, and purple are pure colors or mixtures of other colors.

Future engineers, unite! Discover how to keep a sandcastleâs bridge from falling into the moat.

People have favorite flavors, but what about ants? Which ant food is the most popular?

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

In this science fair project, students use the streak test to tell minerals apart from each other.

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

In this science fair experiment, children demonstrate the relationship between the amount of stuff and the amount of pressure in a closed system.

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

This light bulb science project includes step-by-step instructions for testing the heat from different light bulbs.

Learn how to demagnetize a magnet and how physics can explain this phenomenon with this enlightening science fair project.

This science fair project idea investigates how optical distances change the apparent size of an object as seen through a magnifying lens.

The objective of this science fair project is to explore the relationship between acidic and basic compounds.

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

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.

Kids will explore the corrosiveness of soda in this cool science fair project by leaving pennies submerged in soda overnight.