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How Gas Masks Work
science.howstuffworks.com/gas-mask.htm
Gas masks are used to filter out harmful gas and particles from the air industrial workers breathe. Learn about gas masks and how gas masks are made.
How Xbox Works
electronics.howstuffworks.com/xbox.htm
Microsoft's Xbox was one of the top game systems in its day, and with Xbox Live you can even use it to play on the Web. Take a look inside the Xbox.
Fluid Overload Edema Overview
health.howstuffworks.com/diseases-conditions/cardiovascular/heart/fluid-overload-edema.htm
Edema is a swelling of the feet, ankle and legs caused by fluid overload. Learn more about edema, its causes and its treatments.
Where do butterflies get their striking colors?
animals.howstuffworks.com/insects/butterfly-colors.htm
Butterfly color is some of the most striking in nature. Learn how butterfly wings use ordinary color and structural color.
Why do loud noises cause your ears to ring?
health.howstuffworks.com/human-body/systems/ear/loud-noise-ear.htm
Ringing in ears occurs when noises louder than shouting damage parts of our inner ears. Find out more about why your ears ring at HowStuffWorks.
Paroxysmal Nocturnal Dyspnea
health.howstuffworks.com/diseases-conditions/respiratory/paroxysmal-nocturnal-dyspnea.htm
Paroxysmal nocturnal dyspnea is a sign of heart failure that makes people have trouble breathing while lying down. Learn about paroxysmal nocturnal dyspnea.
How do I start my own country?
people.howstuffworks.com/start-a-country.htm
To start a new country takes lots of plans, relationships with other countries and some political wiles. Learn about the process to start a new country.
Kennedy-Johnson Era
history.howstuffworks.com/american-history/kennedy-johnson-era.htm
The Kennedy-Johnson era is an important aspect of modern American history. Learn more about the Kennedy-Johnson era at HowStuffWorks.
What are tiny leaning cars?
auto.howstuffworks.com/under-the-hood/trends-innovations/tiny-leaning-car.htm
Tiny leaning cars are enclosed like your average car but operate more like motorcycles. Learn more about these unique tiny leaning cars of the future.
Why do tigers swim?
animals.howstuffworks.com/mammals/swimming-tigers.htm
Tigers swim in order to cool off, trap prey and relax. Learn where tigers swim, why other big cats don't join in the fun and who the heck Odin is.