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

Find out whether putting something on top of a plant will inhibit its growth.

Saturn is the ringed planet in our solar system, a gas giant with rings made of ice and dust. Let's make a cool scale model with an old CD and some glitter!

When you cut a flower to put into a vase, it'll eventually wilt, even with water and sunshine. But is there another scientific secret to keeping flowers fresh?

Children have a naturally inquisitive mind. Foster their curiosity with a walk through an autumn field or park to answer age-old “why” questions. As you walk with your child, you can encourage them to ask questions.

Discover whether cold or hot water from the faucet will boil faster on the stove.

Tree rings can tell the age of the tree but also information about the world. This science experiment uses tree stumps to discover new facts.

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.

Find out whether packaged seeds actually do expire in this new science fair project idea.

Get this cool science fair idea to explore how arctic tundra animals change their behavior and adapt to survive in long, cold winters.

This science experiment tests if dog saliva can really help heal wounds.

Do earthworms like moisture or darkness? Find out as we explore the relationship between earthworms and light.

What is the best stain remover for clothes? In this fun and easy science fair project idea, students will identify the best method for laundry stain removal.

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.

The purpose of this science fair project is to determine which conditions and materials quicken the composting process to make the best compost.

Can a horse lead itself to the carrot? Train your horse with carrots and boxes and test horse memory in this fun zoology science fair project.

Learn about this simple machine and make a pulley of your own to use for fun science trials.

What's the chemistry behind dyeing Easter eggs? Will adding vinegar to dye help the eggshell absorb the color? This colorful science project has the answers!

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

In this science fair project, you'll make a "ghost" appear in a test tube, and learn about what happens when hot water and cold water interact.

Science fair project that examines how winter storms form and the relationship between temperature, moisture and snow.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

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.

How greasy are your potato chips? Students will use a reliable method to quantify greasiness and compare different brands in this great science fair project.

In this CD hovercraft science project, students will construct their own DIY hovercraft.

This science experiment has students test whether a snail moves faster on concrete or dirt.

Could there be toxic chemicals lurking in the cupboards and closets of your home?

This science fair project idea explores whether it is easier to balance on a narrow ledge or on a rope.