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How Acid Rain Works
science.howstuffworks.com/nature/climate-weather/atmospheric/acid-rain.htm
Acid rain is caused by emissions of sulfur dioxide and nitrogen oxides from power plants, cars and factories. Find out how acid rain is produced.
Hypergamy: The History and Evolution of 'Marrying Up'
people.howstuffworks.com/culture-traditions/cultural-traditions/hypergamy.htm
Explore hypergamy, the practice of marrying someone of higher social status, its historical roots, and how modern shifts in education and gender roles have transformed this tradition.
5 September 11 Conspiracy Theories
people.howstuffworks.com/5-september-11th-conspiracies.htm
The confusion and terror following the Sept. 11 attacks on the World Trade Center left many searching for answers. Check out 5 September 11th conspiracy theories.
How NATO Works
money.howstuffworks.com/nato.htm
The North Atlantic Treaty Organization (NATO) is built on an alliance between 30 North American and European countries. But it's much more than that.
7 Warning Signs of a Looming Recession
money.howstuffworks.com/7-warning-signs-looming-recession.htm
Good luck predicting the economic future; even the experts get it wrong. But there are sure warning signs to look for when a recession is ahead.
Should You Avoid Aluminum and Teflon Cookware?
health.howstuffworks.com/food-nutrition/avoid-aluminum-teflon-cookware.htm
These two cookware materials have generated some worry. Learn more about avoiding aluminum and teflon cookware.
10 Ways Americans and Europeans Differ
HowStuffWorks looks at come of the cultural differences between Europe and America, like ice consumption, metric system and portion sizes.
Where Are Tornadoes Most Common Around the World?
science.howstuffworks.com/nature/natural-disasters/where-are-tornadoes-most-common.htm
If a student asks you, "Where are tornadoes most common?" you may be able to answer their question in the scope of the U.S., but the global answer depends on geography, climate, and the collision of air masses.
How the Dawes Act Stole 90 Million Acres of Native American Land
history.howstuffworks.com/american-history/dawes-act.htm
An alliance between well-meaning social reformers and land-hungry farmers resulted in a federal act that caused Native Americans to lose millions of acres of land they had once owned.
How Content-recognition Software Works
computer.howstuffworks.com/content-recognition.htm
Content recognition software is used to help prevent copyright infringement. Learn about the development and uses of content recognition software.