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How the Hum Works

science.howstuffworks.com/science-vs-myth/unexplained-phenomena/the-hum.htm

Hummmmmm. Annoyed yet? Imagine if you heard that sound every night no matter what you did. Likened to a diesel engine idling in the distance, the Hum is a sound some people can never get away from. It's even caused suicide. But is it real?

Is the cost of fuel cells a major problem?

auto.howstuffworks.com/fuel-efficiency/alternative-fuels/cost-of-fuel-cells-a-major-problem.htm

Is the cost of fuel cells a major problem? Visit HowStuffWorks.com to learn more about if the cost of fuel cells are becoming a major problem.

What is emphysema?

health.howstuffworks.com/diseases-conditions/respiratory/what-is-emphysema.htm

Emphysema is a disease in which air becomes trapped in the lungs, making it difficult to breathe out. Learn more about emphysema in this article.

How Virtual Surround Sound Works

electronics.howstuffworks.com/virtual-surround-sound.htm

Virtual surround sound mimics the effect of multi-speaker surround-sound systems. Learn about virtual surround sound and find out how sound is perceived.

Casket vs. Coffin: Comparing the Burial Containers

science.howstuffworks.com/science-vs-myth/afterlife/coffin.htm

Made of plain pine or shaped like a shoe, mourners may inter them, suspend them or set them ablaze. How much do caskets and coffins differ?

Where can you get a pulmonary function test?

health.howstuffworks.com/medicine/tests-treatment/pulmonary-function-test.htm

Where can you get a pulmonary function test? Visit HowStuffWorks to learn where you can get a pulmonary function test from this article.

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 Crosley Cars Work

auto.howstuffworks.com/crosley-cars.htm

Crosley cars -- small, bare-bones, and inexpensive -- were unique to the 1930s car market. Learn about the origins of Crosley cars in this article.

1963, 1964, 1965, 1966 Plymouth Valiant Signet

auto.howstuffworks.com/1963-1966-plymouth-valiant-signet.htm

1963-1966 Plymouth Valiant Signet helped keep sales up during what might have been lean years. Find a profile of 1963-1966 Plymouth Valiant Signet.

1968-1969 Plymouth Sport Satellite and GTX

auto.howstuffworks.com/1968-1969-plymouth-sport-satellite-gtx.htm

Plymouth's 'Midsize 5' included the 1968-1969 Plymouth Sport Satellite and GTX. Find a profile of the 1968-1969 Plymouth Sport Satellite and GTX.

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