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

This two-ingredient dough, sometimes called "moon sand," is a quick and cheap way to let kids explore their senses, build fine motor skills, and play.

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

The objective of this project is to evaluate whether a top will spin at different rates during different phases of the moon.

In this cool science experiment, learn about magnetism and poles, and test magnet strength to find out if two magnets are twice as strong as one.

Help your child understand surface tension by showing them how they can create a "skin" on top of water.

This science fair project investigates whether tapping the top or the side of the can will stop a vigorously-shaken can of soda from exploding.

This science fair project demonstrates the magic of arches by challenging students to stack telephone books on top of eggs without breaking them.

Bring the fun of gardening indoors! By stuffing a simple pair of pantyhose with a few grass seeds on top, your child can grow her very own plant pet.

This project compares the strength of one, two, and three-ply toilet paper.

In this project, you will observe and record changes in sunspots over two weeks.

In this science fair project, high school students will try to determine the mathematical patterns in JS Bach's two movement preludes and fugues.

In this experiment, your child will create two compost bins and see if he can determine what attracts fruit flies.

Determine whether a hot liquid cools off faster when liquid is added before or after a two minute wait.

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

In this science fair project, young children discover what happens when two fluids that have different densities get together.

Is it solid or liquid? Create oobleck and witness the amazingly weird oscillation between the two!

Did you ever drink spoiled milk? Find out whether whole milk spoils at the same rate as 2% and skim milk.

Teach your little scientist about the amazing powers of gravity by comparing the falling speeds of two yummy fruits

This science fair project idea focuses on two classes of sugars monosaccharides (fructose) and disaccharides (sucrose or table sugar).

Administer IQ tests to volunteers. have one group practice typical IQ test problems. Then compare results of the two groups.

This science fair project idea determines an average personâs ability to use their anaerobic power system over a period of 2 weeks.

Boost your preschooler's attention to detail by getting her to explore the differences between two different pumpkins: large and small.

Monitor the impact learning how to play chess has an academic performance. Divide subjects into two groups compare GPA

Your preschooler can learn how to siphon water with just two bottles and a plastic tube in this fun, educational science activity.

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

This science fair project investigates which of two learning modes most commonly used in school, visual and auditory, is better for information retention.

This science fair project determines which of two chemical agents can be used to release the drug (tea) from hydrogel crystals.

In this Halloween-themed activity, young learners will find out what happens when they mix two household items together to create a surprising chemical reaction.

Determine whether cats have dominant paws. Observe which paw cat uses to reach for treats, feather, and string. Calculate percentage for two paws.