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How Impossible Colors (Like Stygian Blue) Work

science.howstuffworks.com/impossible-colors.htm

What if there are colors within the visible spectrum that our brains can't perceive? In fact, there are. They're called impossible colors. But some researchers think they've discovered a way to see the impossible.

Can You Answer All of These Questions a Firefighter Should Know?

play.howstuffworks.com/quiz/can-you-answer-all-of-these-questions-a-firefighter-should-know

Fighting fires has been a priority since Roman times and likely even before, as skilled crews banded together to take on nature's most unpredictable element. Do you think you know everything a firefighter should know? Take the quiz and see!

Major Rivers Trivia Quiz

play.howstuffworks.com/quiz/major-rivers-trivia-quiz

Whether or not you get these questions right, "old man river keeps rolling along!" Do you know as much as you think you do about the world's biggest rivers? Put your knowledge to the test and see how well you do!

Who Paid the Largest Criminal Fine in History and Why?

money.howstuffworks.com/largest-criminal-fines-in-history.htm

The largest criminal fines in history have been paid by corporations, not individuals. Who paid the largest criminal fine in history and why?

10 of the Oldest Continuously Inhabited Cities in the World

history.howstuffworks.com/world-history/oldest-city-in-world.htm

It's hard to nail down the oldest city in the world. Some say it's Damascus, Syria, while others suggest it's Jericho, in the West Bank. So which is older?

Why are they replacing all of the traffic lights in my town?

auto.howstuffworks.com/car-driving-safety/safety-regulatory-devices/question178.htm

In my town, they are replacing all of the traffic lights with these new lights that look like they are made of hundreds of tiny bulbs. Why are they replacing all of the lights?

The Ultimate Death Quiz

play.howstuffworks.com/quiz/death-quiz

The Grim Reaper is a personification of death that has been invented and refined over the years to help humans make sense of their own mortality. How much do you know about your own mortality? You can't cheat death, and you can't cheat on this quiz about death, either. So sharpen your scythe and get started.

How the U.S. Secret Service Works

people.howstuffworks.com/secret-service.htm

The Secret Service has two main missions: protecting the president and combating counterfeiting. Learn the secrets of the Secret Service at HowStuffWorks.

How Internet Search Engines Work

computer.howstuffworks.com/internet/basics/search-engine.htm

Internet search engines do your research for you. Learn how internet search engines like Google work, how internet search engines build an index and what Boolean operators are.

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