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Become familiar with ratios and learn how to measure the diameter of the Sun and the Moon in this fun science fair project idea.

Which public places harbor the most bacteria and germs? Test different environments to find out where the most bacteria live in this science project.

How do icicles form and what do they look like? Do this free science fair project and watch the formation of icicles occur right before your eyes.

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

Your preschooler can learn how to siphon water with just two bottles and a plastic tube in this fun, educational science activity.

Looking for a project on fossils? Check out this fun science fair project idea to understand the process of coal formation and fossils part in that formation.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

Measure the porosity of rocks by submerging them in water. Measure how much water each rock "drank," by measuring the difference in water volume.

This experiment will explore whether fractals really repeat themselves infinitely.

This science fair project idea demonstrates how our fingers prune when in water.

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.

Here's a simple science activity that will help your child better understand how wells bring us water.

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.

Help your second grader observe the phases of the moon, and then let the fun loose: he'll get to chart his observations with marshmallows!

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.