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How Refractive Vision Problems Work
health.howstuffworks.com/human-body/systems/eye/vision-refractive.htm
Millions of people have refractive vision problems -- when the eyes get blurry or can't focus on an object. Learn about four major types of refractive vision problems.
Which of These Animals Does Not Belong With the Others?
play.howstuffworks.com/quiz/which-of-these-animals-does-not-belong-with-the-others
Millions of animals exist in the world. Reptiles, mammals, fish and insects all coexist with us. How are they alike? How are they different? Take our quiz, and see if you know the answers!
Where Do Horses Originate From? Not Europe, Not Asia
animals.howstuffworks.com/mammals/where-do-horses-originate-from.htm
Where do horses originate from? We don't mean to sound corny, but the answer really does take us on a journey through millions of years of evolution, migration, and domestication.
13 Largest Cities in New York, Ranked by Population
people.howstuffworks.com/largest-cities-in-new-york.htm
New York, often called the Empire State, is one of fourth-most populated in the United States. According to the U.S. Census Bureau, 19.9 million people live in the state.
What is activated charcoal and why is it used in filters?
science.howstuffworks.com/environmental/energy/question209.htm
Charcoal is carbon. Activated charcoal is charcoal that has been treated with oxygen to open up millions of tiny pores between the carbon atoms. What does this have to do with its absorbancy?
How Venus Flytraps Work
science.howstuffworks.com/life/botany/venus-flytrap.htm
Plants that eat other creatures? It sounds like a genetic experiment gone awry. But there's actually nothing unnatural about it; carnivorous plants have been around for millions of years.
Who Really Struck It Rich During the California Gold Rush?
history.howstuffworks.com/american-history/gold-rush.htm
When you think of the California Gold Rush, you probably think a lot of people made millions off that gold, right? Some did, but it wasn't from panning for it.
Can You Identify These Fortnite Objects from a Photo?
play.howstuffworks.com/quiz/can-you-identify-these-fortnite-objects-a-photo
After just one year since its launch, Fortnite has over 125 million players. Prove you're one of the best by naming all the objects found in the game!
The Secrets of Airline Travel Quiz
science.howstuffworks.com/transport/flight/modern/airline-travel-quiz.htm
Air travel is far more than getting from point A to point B safely. How much do you know about the million little details that go into flying on airplanes?
Will the U.S. Ever End Its Dependence on Foreign Oil?
science.howstuffworks.com/environmental/energy/cut-dependence-foreign-oil.htm
The United States is the world's top producer of oil, but it still depends on foreign countries for millions of barrels, as well. Will there ever be a time when the U.S. is totally independent when it comes to oil production?