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When Does an Epidemic Become a Pandemic?
health.howstuffworks.com/diseases-conditions/infectious/pandemic.htm
The World Health Organization just declared the coronavirus a full-blown pandemic. What does that even mean, and how is that different from an epidemic?
Can You Ace This Hard Harry Potter Quiz?
play.howstuffworks.com/quiz/the-hardest-harry-potter-quiz-youll-take-today
It's levi-O-sa, not levi-o-SA - or is it? There's tons to know in the magical world of Harry Potter. From heroes and villains to classes and spells, can you pass this Harry Potter quiz?
Do You Really Know the U.S. Constitution?
play.howstuffworks.com/quiz/us-constitution-quiz
The U.S. Constitution is a document with a history, and most of us learn all about it in school -- well, maybe not all about it. This Constitution Day, test your knowledge of some lesser-known facts about the U.S. Constitution.
Can You Pass a Basic Chemistry Test?
play.howstuffworks.com/quiz/can-you-pass-basic-chemistry-test
Do you know the periodic table from Argon to Zirconium? Test your chemistry knowledge with this basic quiz! It'll be a gas!
What Was Really Behind Agatha Christie's Mysterious Disappearance?
entertainment.howstuffworks.com/arts/literature/agatha-christies-disappearance.htm
In 1926, famed crime novelist Agatha Christie went missing for 11 days under very strange circumstances. Even today, questions linger about why she did it.
¿Te sabes las capitales de los países americanos?
play.howstuffworks.com/quiz/can-you-name-all-these-capitals-the-americas-learn-sp
Ya sea que vengas de Norteamérica o Sudamérica, o de fuera del continente americano, ¡intenta adivinar las capitales de estos países!
Maillardet's Automaton Is a Marvel of 19th-century Robotics
science.howstuffworks.com/maillardets-automaton.htm
Maillardet's Automaton, built around 1800, can write poems and draw pictures and was a precursor to today's sophisticated robots.
How Nuclear Bombs Work
science.howstuffworks.com/nuclear-bomb.htm
Nine countries hold the 13,000 nuclear weapons in the global stockpile. That's less than during the Cold War but it doesn't change the fact that these bombs are still a threat to global humanity. So how do they work and are we close to nuclear war?
How Roller Coasters Work
science.howstuffworks.com/engineering/structural/roller-coaster.htm
They don't have engines, brakes or accelerators. No, these amazing machines rely on physical, centripetal and gravitational forces to urge thrills, screams and that sinking stomach feeling we all love (and hate). Read more about the science of fun.
How Freedom of the Press Works
people.howstuffworks.com/freedom-press.htm
HowStuffWorks looks at press freedom in the U.S. and around the world.