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Save money by making compost! Use this science fair project idea to determine which composting methods best encourage decomposition of organic matter.

Brine shrimp usually live in saltwater. Investigate how salt concentration (salinity) affects the rate at which brine shrimp eggs hatch.

Science fair project that tests the effects of temperature change on the reactivity of the catalase enzyme.

This science fair project looks one of the most important factors affecting seed germination: water. A fun and easy plant biology experiment for 3rd graders.

This science experiment explores why leaves change color in the fall and the role of photosynthesis in leaf coloration.

Sure, you already know that water is made up of hydrogen and oxygen, but did you know that oxygen levels differ in different types of water?

Is it a square or a circle? See if you can trick your friends with this zany science project!

What is a wedge? Kids find out by experimenting with different wedges in this simple science fair project idea.

Kids will love making clouds and learning how to make a water cycle model in this fun science fair project idea that explores evaporation and precipitation.

Discover which absorbent material is the best; the Shamwow, paper towels, or cotton towels.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

Check out this fun science fair project to make a vinegar and baking soda balloon and demonstrate how gas is created as a result of the chemical reaction.

Science fair project that explores the phenomenon of Non-Newtonian fluids by exerting force on different materials.

This science fair project idea teaches how the gases and pollution in the air affect the earth's atmosphere temperature.

This classic children's game demonstrates how sound travels through air vs. through a solid.

This science fair project idea explores which is better for diffusion and cell absorbing, more surface area, or more volume.

Study the effects of wind and temperature on evaporation. Place wet sponges in different environments, check at regular intervals, track time required to dry.

Make a list of items that need repurposing such as e-waste, batteries and mattresses. Invent your own original repurposed design.

Science fair project that examines the benefits of the plant enzyme: pectin methyl esterase (PME). Where is PME found in the plant? What does it do chemically?

Why does honey crystallize? This science fair project project answers this question and identifies the variable that makes this sweet solute crystallize faster.

Kids will learn about insulation, heat conduction, and the economic benefits of energy efficient windows in this cool science fair project.

In this free science fair project idea, kids will conduct an easy electrolysis of water experiment to test solutions of salt, baking soda, tap water, and more.

Kids learn how fiber optics work with a dramatic total internal reflection experiment using a fish tank, water, and a laser pointer.

Science fair project that demonstrate how abrasions are formed on rocks in nature and the variations between types of rocks.

In this science fair experiment, high school students determine if all proteins denature at the same temperature.

Protozoa and ciliate and amoeba, oh my! The objective of this science fair project is for students to use a microscope and identify microscopic life.

Science fair project that determines what percentage of air is made up of oxygen by examining the chemical reaction between oxygen and rust.

Kids will learn how to clean fish tank the natural way. Add catfish to the tank and see if your water gets cleaner.

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.

Experiment about connection of senses of taste and smell. Using blindfold and noseplugs, administer blind taste test. Analyze results and organize data.