Kids will learn how to make a steam powered rocket boat, also called a putt putt boat or a pop pop boat, in this great science fair project for 4th graders.

Play with balance and simple engineering as you hurry to create a sturdy rock tower.

Here's a math, science, and social studies activity: help your kindergartener become a "coin archaeologist" by examining how different coins look and feel.

Kids often ask, "how tall am I?" This science fair project seeks to determine how well kids can guess their own heights.

Take a closer look at your furry friend (or the furry friend of a neighbor -- with permission) to discover if communication exists between cats and humans.

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

In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

In this science fair project, students make their own rain gauge to measure rainfall.

This science fair project idea examines how well individuals can remember a story they were told and how accurately they pass that story along.

The objective of this science fair project is to test the growth rate of a plan in a crystal medium in comparison to traditional soil.

In this project, you'll build a model of the earth, complete with all seven continents and four major oceans.

What is the hydrologic cycle and how does it work? Check out this fun and easy science project where you will model and learn about Earth's water cycle!

This biodiversity project examines the biodiversity in your own backyard.

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.

Start your toy engines -- this is going to be a fast and friction-filled race!

Science fair project that examines the behavior of water and gravel in creek beds and the formation of sedimentary rocks.

Examine whether distilled water, spring water, or regular tap water yield faster plant growth.

Science fair project which evaluates different athletic shoes in order to find out whether any of them affect a person's ability to run.

How does frost form? How fast does it form? Do this simple science project using a plastic glass, rock salt and some water to learn about deposition.

Here's an easy experiment that lets your first grader practice the scientific method, while watching a caterpillar eat.

Is it magic? No...it's the amazing, gravity-defying capillary action experiment! Kids will love this dramatic and enlightening science fair project.

Science fair project examining barometric pressure, and how it can be used to predict the weather. How does atmospheric pressures relate to weather conditions?

In this activity, your child will be challenged to make a tower using paper cups.

What's the science behind those out-of-sight roots? Find out if you can trick roots into growing in different directions.

How do animals keep warm? In this experiment, find out whether fat insulation resists cold temperatures and learn how this works in the animal kingdom.

This science fair project idea examines the reason boats are shaped and engineered.

What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.

In this experiment, kids will see if pruning tomato plants makes them more fruitful and learn about the factors that contribute to a plant's fruit production.

What is biodiversity? Kids will study different areas of their backyards to see which is the most diverse to learn about biodiversity and random sampling.

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.