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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.
8 States With the Most Tornadoes in the U.S.
science.howstuffworks.com/nature/natural-disasters/states-with-the-most-tornadoes.htm
A tornado is a violently rotating column of air that stretches from thunderstorms to the ground. In an average year, hundreds of tornadoes occur in the United States, especially in a region famously dubbed Tornado Alley.
Is Greenland Part of North America? Geologically, Yes
people.howstuffworks.com/is-greenland-part-of-north-america.htm
Greenland is one of the most unique places on Earth, and it often sparks a big geographical question: Is Greenland part of North America?
Rarest Animals in the World: 10 Critically Endangered Species
animals.howstuffworks.com/endangered-species/rarest-animals.htm
The 10 rarest animals in the world are still found in the wild but are dangerously close to becoming extinct.
How Environmental Organizations Work
money.howstuffworks.com/economics/volunteer/organizations/environmental-organizations.htm
Environmental organizations all try to help in different ways. Learn about environmental organizations at HowStuffWorks.
Are millions of modern humans the direct descendants of Genghis Khan?
people.howstuffworks.com/culture-traditions/genealogy/descendants-of-genghis-khan.htm
Are millions of people the direct descendants of Genghis Khan? Find out and explore the history and genealogy of Genghis Khan.
How Urban Sprawl Works
science.howstuffworks.com/environmental/green-science/urban-sprawl.htm
Urban sprawl occurs when people move from cities to the areas around them and develop the land with houses, businesses and roads. Learn about urban sprawl.
Basic World Trivia Quiz
play.howstuffworks.com/quiz/basic-world-trivia-quiz
The Earth has experienced violent destruction that left beautiful scars. Mountains, valleys, islands and rivers paint the planet we know as the Blue Marble. What do you know about the Earth and the world in which we live? Can you pass a basic world trivia quiz?
What If Everyone on Earth Had Easy Access to Clean Water?
science.howstuffworks.com/science-vs-myth/what-if/what-if-access-to-clean-water.htm
Would a world with ample water for all mean less disease? Fewer wars? Globally improved health and finances? Sip along with us as we wonder what if.
17.6 Million Americans Still Lack Access to Healthy Food
recipes.howstuffworks.com/americans-still-lack-access-to-healthy-food.htm
The number of Americans living in food deserts has decreased, but there's still a long way to go before everyone has access to healthy food.