In this science and engineering activity, children will explore types of tunnels and their purposes and then design and build a tunnel of their own.

How does a compass work? What's a magnetic field? Kids will build their own compass at home to find the answers in this great science fair project idea.

Your third grader will be amazed at the explosive combination of vinegar and baking soda in these chocolate volcano cupcakes with white chocolate "lava."

Science fair project that compares the freezing temperature of salt water and freshwater in order to learn about supercooling and condensation nuclei.

Science fair project that compares the ecology of different soil samples by identifying which sample has the most invertebrates living in it.

In this windmill model science project, you will build a windmill to learn about wheel-and-axle machines and how these simple machines are used to do work.

Learn about savanna flora and fauna in this science project! Take a look at characteristics of tropical grassland plants and animals that help them survive.

This science fair project compares the allelopathic affects of juglone, a chemical agent produced by the Black Walnut tree, on two plants.

Set off an a science adventure as you prepare a row of bee homes for your new visitors.

This science fair project idea attempts to train a worm to complete a simple maze in order to find out if worms can learn and remember.

Make sourdough bread...and learn some colonial history and modern science in the process!

You've heard all about oil spills, but can they really be that bad? After all, vegetable oil is in almost every yummy baking good from cookies to brownies.

It's not actually that hard to get energy from garbage! Kids learn how to make biogas in the form of methane with this cool and easy science fair project idea.

Do you think heat can affect a plant's growth rate?

This science fair project idea determines if the color of light affects the growth of plants.

This science fair project idea determines if the temperature of rubber effects how high it bounces.

Did you even wonder why some rocks are round and smooth while others are broken up into small pieces?

This science fair project idea develops an understanding through experimentation of which shapes are the most structurally strong.

Learners hypothesize about and experiment with soil erosion in this hands-on activity.

Create safe lightning for kids! They'll learn how to make lightning at home with this fun science fair project idea illustrating static charges and grounding.

The rock cycle will come alive for your child when he uses broken crayons to create the three basic rock types.

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.

In this Bernoulli's Principle experiment, you'll learn how an increase in the speed of a fluid, like air, decreases pressure.

Kids learn about examples of mechanical weathering and conduct an experiment with seeds and plaster in this cool geology science fair project idea.

This science fair project idea explores whether cats can be trained in the same way that dogs can.

Kids will create their own version of Richard Feynman's rubber band heat engine to learn about thermodynamics with this cool science fair project idea.

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

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

What is topography? Kids find out by learning to make and read a topographic map in this awesome science fair project idea.

This science fair project idea explores the different properties & interactions of sugar molecules.