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.

Help your child make a beautiful homemade sandcastle that will last!

Have you ever seen fruit decay? Find out if a fruit will rot faster if you open it versus leaving it untouched!

Examine the effect of pressure on carbonation in soda.

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.

Kids get step-by-step instructions for how to make a rubber band car and explore the physics of potential energy with this fun engineering science fair project.

Explore the scientific concept of capacity by seeing how many pennies you boat can hold before it sinks!

Check out this cool science fair project idea that models the behavior of the cold desert plants: xerophytes and halophytes.

This science fair project idea examines which type of insulation holds in the most heat.

This science fair project idea investigates how color affects temperature.

Do this activity to help your kids see how seeds contain "baby" versions of big plant stems, roots, and leaves.

In this science fair project, learn how a mineral streak is made and how it can help identify an unknown mineral.

In this science experiment, observe convection currents forming and learn about how heat energy moves in liquids from hot to cooler areas through convection.

This science fair project idea determines if crystals will absorb food dye and if colors will mix by the process of diffusion.

Let your young scientist explore a brave new world of sound with an experiment that just requires a handful of common household items.

This plaster fossil activity is a fun supplement to preschool science. Use plaster to make imprints of your child's handprints, footprints and other objects!

Check out this cool science fair project on identifying rocks and minerals for kids.

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!

Help your child understand the scientific concept of evaporation with this fun outdoor science activity.

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

This experiment works due to a simple principle: plants need light. Build a shoebox maze and watch the plant work though the obstacle course, searching for sun.

Here's a fun activity that will introduce your fourth grader to the concept of frictionless motion by constructing a hovercraft.

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

This science fair project idea explores whether a sundial is as accurate as an atomic clock when telling time.

Help your kindergarten science maven explore the water cycle without getting everything wet.

In this project children practice the scientific method while playing with puffy paint.

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

It's a rare kid who doesn't like a sandbox. Next time you're out digging, build in some earth science, too.

This is a quick, easy science fair project that conveys the idea of density to preschool and early elementary children.

Uh-oh! Is that a pill sitting on the counter or a piece of candy?