How do we know that air exists when we can't see it, taste it, or touch it? Here's a classic experiment that will teach your kid some basics of aerodynamics!

Here's a science activity that lets a first grader use an empty dish detergent bottle to create his own fountain as he explores air pressure.

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

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

This science fair project idea demonstrates how air resistance contributes to denser objects falling faster than less dense objects.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

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.

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!

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?

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

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

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

In this science fair experiment, children demonstrate the relationship between the amount of stuff and the amount of pressure in a closed system.

Here's a science experiment that gives your kids a chance to see how fire needs oxygen to burn, with a little math and writing practice thrown in.

Science fair project that examines the different types of precipitation, evaluates the density of snow and calculates the ratio of snow-to-liquid.

How does water pressure change with depth? Kids learn how pressure works underwater with this cool and easy demo.

This science fair project teaches students about wilting and browning of salad greens.

How does the size of a vibrating surface affect the pitch of a drum? Learn about drum size and pitch with this easy science fair project idea.

Do plants get crowded? Have your curious kid investigate how plants respond if they're forced to grow together in a confined space.

The goal of this evaporation experiment is to learn about how different external conditions affect drying time.

This science experiment examines the role of fat in food, especially in making bread rise and whipping cream.

What is surface tension? Kids will discover how water-skating insects use surface tension to keep from sinking by making a model water walker.

Do you think you can blow down a sand castle with a mighty wind? Find out which material stands up best to erosion in this erosion experiment.

In this experiment you will replicate the mummification process by making a hot dog mummy.

This science fair project idea demonstrates that plants give off water.

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

Ready for takeoff! Make science fun and teach about levers and fulcrums as your child sends buttons flying.

This balloon-powered car project is a great way for your kid to learn about energy and how it can be used efficiently.