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.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

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

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.

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.

This classic children's game demonstrates how sound travels through air vs. through a solid.

In this design thinking activity, your child will choose an animal to research, learn about the animal’s habitat, and then replicate the animal's habitat using household items.

This science fair project creates a visual model of whatâs happening to sound waves as a car approaches and then leaves.

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

In this fun activity, your child will create their very own solar oven to bake s'mores!

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

This experiment will determine how different kinds of light affects the strength of bakerâs yeast.

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

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

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

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

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

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

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

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

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

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

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