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Your search for "tunnels" returned 506 results
What Are Mines?
science.howstuffworks.com/engineering/structural/underground-mining.htm
Underground mining has come a long way from the days of men with pickaxes and canaries. It relies much more heavily on machinery that makes it much safer than in the past. Which techniques are used in mining today?
Can You Guess the Formula 1 Track From an Aerial Image and a Hint?
play.howstuffworks.com/quiz/can-you-guess-the-formula-1-track-from-an-aerial-image-and-a-hint
We help you yield a speedy first guess with this Formula 1 quiz. Our visual exercise tests your recognition skills to the fullest! We cover all corners of the globe to present F1's finest circuits. Rev up the brain power and enjoy your way along this course!
Can You Match the National Park to the U.S. State?
play.howstuffworks.com/quiz/can-you-match-the-national-park-to-the-us-state
There's so much more to America than fascinating buildings and elaborate cityscapes. This U.S. national parks quiz showcases nature's outstanding design achievements. Prepare to be wowed by stunning facts and photos!
Can You Name All of These World Heritage Sites?
play.howstuffworks.com/quiz/can-you-name-all-of-these-world-heritage-sites
We only have one Earth, and the easiest way you can show your appreciation for it is by recognizing its brilliance. Some of the world's most endangered animals, oldest cities and rarest land formations are protected in World Heritage Sites around the globe. Put your skills to the test and see if you can recognize them all.
When Were the Twin Towers Built?
science.howstuffworks.com/engineering/structural/wtc.htm
The twin towers of the World Trade Center were true originals -- their history is one of innovation, persistence and grand ideas.
How the U.S. Customs Service Works
people.howstuffworks.com/us-customs-service.htm
A fascinating article that tells you everything you need to know about U.S. customs laws, how they affect your travels and what you may bring back into the United States!
Ferrari F1
auto.howstuffworks.com/ferrari-f1.htm
Ferrari is a legendary name in Formula 1 racing. Learn about Ferrari's most fascinating F1 cars and follow the creation of a dynasty.
How Hibernation Works
animals.howstuffworks.com/animal-facts/hibernation.htm
Hibernation is a survival strategy designed to conserve energy when conditions are harsh. Learn all about hibernation, like how it affects the body.
2007 Ford Mustang and Shelby GT500 and Shelby GT
auto.howstuffworks.com/2007-ford-mustang-and-shelby-gt500-and-shelby-gt.htm
The 2007 Ford Mustang model year included the Shelby GT500, the most powerful production Mustang ever. Learn all about the 2007 Mustang models.
How NASCAR's Car of Tomorrow Works
auto.howstuffworks.com/auto-racing/nascar/nascar-basics/nascar-car-of-tomorrow.htm
You may have heard about the NASCAR Car of Tomorrow, but how much do you really know about it? Learn about the NASCAR Car of Tomorrow at HowStuffWorks.