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Deadly 1948 Donora Smog Launched the U.S. Clean Air Movement
A killer smog 70 years ago helped lead to the first federal air pollution laws.
Can You Identify These National Treasures?
play.howstuffworks.com/quiz/can-you-identify-these-national-treasures
The country is full of distinctly American foods, forests, drinks, parks, celebrities, athletes, products, services and more. We may take them for granted, but they're our national treasures. How many can you name?
From Alabama to Wyoming, Can You Name Every Capital?
play.howstuffworks.com/quiz/from-alabama-to-wyoming-can-you-name-every-capital
Are you smarter than a sixth-grade geography student? If you can name all 50 state capitals, you will have earned yourself a gold star! Do you think you can do it, or has it been too long since you tried? See how well you do!
How Lewis and Clark Worked
history.howstuffworks.com/historical-figures/lewis-and-clark.htm
Lewis and Clark are famous for exploring the Louisiana Purchase. Learn about the exploration of Lewis and Clark and their Corps of Discovery.
What's the Biggest State in the U.S.A.?
science.howstuffworks.com/environmental/earth/geophysics/biggest-state-in-usa.htm
The United States is divided into 50 states, small and large. So which is the biggest state in the U.S.A.?
Dog Parks Guide
animals.howstuffworks.com/pets/pet-travel/dog-parks.htm
Dog parks are as diverse as the breeds that use them. Learn all about dog parks in this article from Animal Planet.
Can You Name What These Small Towns Are Renowned For?
play.howstuffworks.com/quiz/can-you-name-what-these-small-towns-are-renowned-for
Miami, Chicago, NYC and L.A. might get all the attention, but Small Town, USA, is the real star of the country. It has given rise to some of America's most important legacies. Can you look at these small towns and guess why they're famous?
Is This Film-Featured Town a Real Town or a Fake Town?
play.howstuffworks.com/quiz/is-this-filmfeatured-town-a-real-town-or-a-fake-town
Some film-featured towns are more important to the movie than the characters. We can't visit the wizard without Oz, and LA isn't as magical as La La Land. Do you know which towns are real and which towns are fake?
Can You Name the States From Smallest to Largest?
play.howstuffworks.com/quiz/can-you-name-the-states-from-smallest-to-largest
For this quiz, size does matter, and you're gonna have to know a thing or two about land plots to even think of passing. We'll be impressed if you can tell us where Delaware lands on this quiz.
10 Worst Plants for Your Allergies
home.howstuffworks.com/gardening/garden-design/10-worst-plants-for-your-allergies.htm
Do you suffer from outdoor allergies? Check out the 10 worst plants for allergies.