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.

This recipe makes bubbles that not only blow up nice and big, but do tricks and experiments! How do you do it? It's not a secret, it's science!

Make a periscope with milk cartons and mirrors! This preschool activity is great for playing secret agent and learning simple physics.

Science fair project in which you will start a fire from scratch without using matches or a lighter.

Check out this cool middle school science fair project idea to determine if shopping carts are really carriers of harmful bacteria.

The fish most kids see is usually filleted, and it's hard to see how it came from a lake or sea. This cool gyotaku activity blends life science with art!

Determine whether carpet placed on a lawn will kill grass and weeds. Choose an area of lawn that you would like to remove, record grass that is dead or dying.

What causes sound? Here's a simple science experiment that adds a visual element to the science of sound to help kids better understand this tricky concept.

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

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

This activity provides a solution to all those leaves on your doorstep, while also giving your child a fun science lesson.

This science project challenges students to study the salt content in tap water and learn about electrochemistry.

Develop your child's green thumb with this easy planting activity. These plants are guaranteed to grow fast and are "brown-thumb" proofed!

Kids will explore the corrosiveness of soda in this cool science fair project by leaving pennies submerged in soda overnight.

How can you tell the difference between a spider and an insect? Your child will find out as he makes a tray of yummy creepy crawly snacks.

Check out this fun science fair project idea to learn about seismic waves and how fast they travel during an earthquake.

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

This fun, think-outside-the-box activity introduces kids to gravity and other basic scientific concepts as they construct an impressive marble run!

Make your own helicopter using a paper clip and a sheet of paper. Hold the spinner up in the air, let it go, and watch it spin gracefully to the ground.

Help your first grader design and create his very own bird feeder out of an empty milk carton.

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?

You and your child can create this beautiful butterfly mobile for hanging anywhere in the home (and learn about this magical creature while you're at it).

This science fair project idea examines whether boys and girls differ in reflexes.

Can a toy car determine the strength of a magnet? In this cool magnet science fair project, young scientists will learn how to measure the strength of a magnet.

Create your very own scented hand sanitizer that will help your child to keep those nasty germs at bay!

This educated-guessing game is great for preschoolers. This activity helps your child work on her reasoning skills.

Take a dive into the candy jar with this yummy science experiment.

In this plastic wrap science fair project, you'll learn about polymer permeability and find out which plastic wrap keeps food from dehydrating best.