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How Air Purifiers Work
home.howstuffworks.com/air-purifier.htm
Americans spend an estimated $250 million annually on air purifiers for their homes. Learn why people buy air purifiers and how they work.
How Hot Air Balloons Work
science.howstuffworks.com/transport/flight/modern/hot-air-balloon.htm
Hot air balloons are about as simple as flying can get - no engine, no moving parts really, and very little the pilot can do to control the vehicle. Find out what it's like to fly a hot air balloon!
How Does AC Work in a Car?
auto.howstuffworks.com/automotive-air-conditioning.htm
If you're buying a new car, you know air conditioning is almost certainly a standard feature. But it wasn't long ago when AC was an expensive option. Find out how this now nearly universal feature works.
How Often to Change Your Furnace Filter
home.howstuffworks.com/home-improvement/heating-and-cooling/air-filters-clean.htm
If my home's air filters are clean when I change them, are they really working? Find out the answer to this and learn more about air filters.
What Is Freon and How Does It Work?
home.howstuffworks.com/home-improvement/heating-and-cooling/what-is-air-conditioner-freon.htm
Freon AC is a colorless gas that absorbs heat and humidity. But it's being phased out in the United States, so what does your AC unit use to keep cool?
Which Elite Military Unit Do You Belong In?
play.howstuffworks.com/quiz/which-elite-military-unit-do-you-belong
It's a given that you're someone who is in excellent physical condition and is incredibly brave. With that established, let's see which group would utilize your particular talents the best.
Can You Identify the State Abbreviation From a State's Outline?
play.howstuffworks.com/quiz/can-you-identify-the-state-abbreviation-from-a-states-outline
When it comes to geography, they say the average American can't locate Afghanistan on a map, but how about Iowa? Take a look at these 50 state outlines and see if you can identify the correct abbreviation.
How to Become an Air Traffic Controller
science.howstuffworks.com/military/army-careers/how-to-become-army-air-traffic-controller.htm
Want to know how to become an Army air traffic controller? Visit HowStuffWorks to learn how to become an Army air traffic controller.
What State Is Washington, D.C., In?
history.howstuffworks.com/american-history/what-state-is-washington-dc-in.htm
Washington, D.C. is the seat of America's federal government. But what state is Washington, D.C. in?
Watch Your Six: Military Jet Pictures
science.howstuffworks.com/military-jets.htm
This military jets image gallery shows some of the planes used by the U.S. Air Force. Take a flight through these military jet pictures.