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

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.

In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

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

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!

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

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

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

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.

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

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

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

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

Young scientists will investigate people's preferences for saltiness, and make some inferences about genetics and diet.

Here's a first grade ladybug game that explores how air can move solid objects, and adds some measurement practice, too. Play, learn, and enjoy!

What's the relationship between temperature, air humidity and static electricity? Kids will find out with this free static electricity science fair project.

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

What's the difference between a microwave and an oven? Use mashed potatoes to explore which kitchen appliance does a better job at keeping food warm.

Water, along with soil and light, is a necessary component for plant growth. So what's better for promoting plant growth: tap water, or rain water?

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

What causes the seasons to change? Kids find out by modeling the earth's tilt using a globe, flashlight and graph paper in this cool science fair project idea.

In this fun guessing game, your child uses his sense of smell and taste to figure out what is in the container. Here's how to play:

Most people assume that cold water freezes more quickly, but could that be false? Does hot water freeze faster than cold water? Let's find out!

In this exciting and empowering challenge, your child will construct a bridge using marshmallows and toothpicks!

In this activity, your child will be challenged to use simple materials to create a catapult for a small, lightweight toy.

In this activity, your child will be asked to create a boat that can successfully float while holding 25 pennies.

In this fun design challenge, your child will get creative with making structures out of toothpicks and gumdrop candies.

In this science fair project, we'll use a liquid crystal thermometer to find out whether exercising makes a difference in people's temperature.

Learn about magnifying glasses, concave lenses and inverted images by sending rays of light through a magnifying glass in this cool science fair project!

In this experiment, students will create their own version of coquina, a sedimentary rock thatâs formed by seashells and sand, cemented by seawater minerals.