Inspire your child to put on her engineer hat for the day, as she builds her very own, double-decker bridge.

Science fair project which determines if plants really do need water to grow, or whether they just need to be kept wet.

Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

Science fair project about work and energy which uses a simple mathematical formula to predict how far a jar will roll down an incline.

This kinesthetic learning activity will help your fourth grader get a firm grasp on the immensity of the solar system.

This science project encourages students to investigate the Mozart Effect, the idea that classical music promotes learning.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

How powerful is the reaction between baking soda and vinegar? Find out here!

Do you love to make Jell-O? Find out in this science fair project idea if it is possible to make Jell-O with just warm water.

The purpose of this science fair project is to demonstrate how yeast, a fungus, causes bread to rise.

Help your child experiment with the combination of acid and baking soda by making these homemade bath bombs!

Excite your fourth grader by recreating ancient Viking myths. This miniature longboat will explore the principle of water molecules expanding when heated.

Observe how your brain works while it is focused on one thing, and how it works while you are distracted by another thing.

Make some easy homemade yogurt with your young scientist, and see what a few 'live' bacteria can do in the right conditions!

This science fair project teaches kids experimental design and how to test if subjects can really sense if they are being watched.

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 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.

This taste buds science experiment demonstrates how strongly our sense of smell controls what we taste.

In this science fair project, students examine under what conditions individual plants release seeds and how far the seeds are released.

Make your own marshmallows and mix up some very interesting third grade chemistry lessons while you're at it!

Help your child create a tasty treat that will demonstrate exactly how frogs survive a freezing season.

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

Kids will learn some cool stuff about chemical reactions by determining what happens when you mix different concentrations of hydrogen peroxide and yeast.

In this science fair project, apply the principles of leverage and force by building six simple machines designed to set weights in motion.

Check out this cool science project idea to learn about rocks and explore the cycles of formation, breakdown, and reformation of rocks in the Earth's crust.

Do you have your isopods straight? Learn about sow bug and pill bug behavior by building a terrarium to study them in!

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

Milk is made of water and fat; but how can you separate the two? Find out in this color changing milk experiment.

Learn about the fruit fly life cycle in this experiment. Capture fruit flies to examine various stages of insect metamorphosis.

Have you ever noticed the way a dropped stone makes a fun pattern in a pond or lake? What's the science behind these splashy occurrences?