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The Worst Air Quality in the World Is in Mountainous Terrain
science.howstuffworks.com/environmental/green-science/worst-air-quality-in-the-world.htm
Air pollution is widely recognized as a major threat to public health, and while air quality data is widely available, the large-scale solutions are often difficult to enact. There are efforts in most developed countries to improve air quality, and pretty much everyone (except the polluters) agrees that it's an urgent problem.
The North American Geography Quiz
play.howstuffworks.com/quiz/north-american-geography-quiz
North America encompasses huge expanses of water and land. What do you know about this area's people, geology and climate? Take this quiz to find out.
Can You Name All of These American Wildflowers?
play.howstuffworks.com/quiz/can-you-name-all-of-these-american-wildflowers
Tom Petty said, "You belong among the wildflowers." But would you be able to name them if you saw them in an image? Check out the ones we've put together, and see how well you know the wildflowers of America!
Can You Guess Which of These Two American Cities Is Furthest North?
play.howstuffworks.com/quiz/can-you-guess-which-of-these-two-american-cities-is-furthest-north
From Florida to Maine or California to Alaska, the United States is a vast country with plenty of interesting cities to explore. But do you know which cities are located north or south of others? Take a trip through this quiz to find out!
Can You Match The US City To Its Time Zone?
play.howstuffworks.com/quiz/can-you-match-the-us-city-its-time-zone
Six time zones cover the whole United States, but do you know what time it is in which city? Test your time zone IQ with this timely HowStuffWorks quiz!
Countries That Start With 'O'
history.howstuffworks.com/world-history/countries-that-start-with-o.htm
Former countries that start with "O" include Orange Free State and Oldenburg but these states have since dissolved. There is now one remaining holdout between Asia and Africa: the Sultanate of Oman.
Arizona's Grand Falls Gushes to Life Again
science.howstuffworks.com/environmental/earth/geology/grand-falls-arizona.htm
Arizona isn't all desert. Take Grand Falls, aka "Chocolate Falls." It is dry most of the year, but when it rains, this waterfall pours.
The Longest Road in the U.S. Passes Through a National Park
history.howstuffworks.com/american-history/longest-road-in-the-us.htm
Few things capture the spirit of adventure quite like the vast network of highways stretching across the United States. But have you ever wondered which road takes the crown as the longest?
Tibetan Glacial Ice Core May Hold Clues About Climate Change
Scientists from The Ohio State University have drilled longest ice core from outside the poles.
The Only Wild Jaguar in the U.S. Has Finally Been Filmed
animals.howstuffworks.com/mammals/wild-jaguar-finally-filmed.htm
A three-year hunt has paid off with video footage of the only wild jaguar in the United States. Learn more in this HowStuffWorks Now article.