Air invisible; it doesn't make sounds; you can't pick it up and throw it. So how do we know it exists? Help your second grade scientist figure it out.

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

.Have you ever had problems with your wifi signal strength? In this experiment you will learn about how wireless signals pass through the air and solid objects.

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!

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.

Love is in the air, and there's no time like Valentine's Day for your high schooler to learn about the most romantic poetic form: the sonnet!

The purpose of this science fair project is to build a basic radio.

This fun middle school science fair project idea helps student discover the concepts behind deep sea diving and how Cartesian divers work.

Science fair project that examines what causes thunder and why a thunderclap sounds so loud. How is lightening related to the creation of sound waves?

Science fair project that guides you through how to test the humidity in the environment using a homemade psychrometer.

Science fair project that measure winds speed, temperature, and time of day in order to determine the origins of the wind.

Science fair project that examines how temperature affects density and how density in turn affects the behavior of helium gas.

Does your child always demand to know why the sky is blue, how the sun moves across the sky, or where wind comes from?

In this simple science project, learn about what causes dew and what affects dew formation with a drinking glass, ice, and a soda bottle.

Teach your kids about entropy with this fun, easy exercise, and teach your money to dance while you're at it!

Science fair project which teaches you about the principles of physics within a vacuum by creating a vacuum chamber.

Science fair project that examines condensation and the conditions needed in order for dew to form.

This science project researches the correlation between barometric pressure and wind velocity.

Here's a fun activity that will introduce your fourth grader to the concept of frictionless motion by constructing a hovercraft.

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

What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.

Experiment with buoyancy to learn how a submarine rises and sinks in this classic science experiment.

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

Do heavier objects fall faster than lighter ones? Students learn the answer by watching the effect gravity in a vacuum has on a coin and a feather.

Turn the common pastime of constructing paper airplanes into a lesson on the physics of aerodynamics and flight with this fun science activity.

Learn how to make a hygrometer to measure relative humidity in this project. Make a sling psychrometer hygrometer with gauze, thermometers, and a bottle.

This science fair project idea determines if the size of the parachute will change the rate at which an object falls.

Science fair project that determines the correlation between wind direction and subsequent weather patterns.