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When Were the Twin Towers Built?

science.howstuffworks.com/engineering/structural/wtc.htm

The twin towers of the World Trade Center were true originals -- their history is one of innovation, persistence and grand ideas.

How Much Do You Know About Quebec?

play.howstuffworks.com/quiz/how-much-do-you-know-quebec

Quebec (or Québec, depending on who you ask) is affectionately known as "la belle province" - the beautiful province. From an iconic cathedral to winding cobblestone streets, Canada's biggest province is a sight to behold. Start the quiz and you'll be transported to this mesmerizing province.

Ignaz Semmelweis Was Ridiculed for Advocating Hand-washing for Doctors

history.howstuffworks.com/historical-figures/ignaz-semmelweis.htm

While Semmelweis wasn't the first doctor to advocate for hand-washing, he was the most vocal proponent at the time. And doctors didn't believe it.

20 Memorable Moments of the 21st Century So Far

history.howstuffworks.com/historical-events/20-memorable-moments-21stcentury.htm

The world has come a long way since we were prepping for Y2K. We've witnessed some major moments since then. HowStuffWorks looks at 20 big ones.

10 Worst Ways History Has Repeated Itself

history.howstuffworks.com/historical-events/10-worst-ways-history-has-repeated-itself.htm

As they say, if we don't learn from history, we're doomed to repeat it. And as these 10 historical events prove, humans seem to be more prone to repeating than learning.

10 Reasons Why Space Exploration Matters to You

science.howstuffworks.com/10-reasons-space-exploration-matters.htm

Yes, we have some amazing inventions thanks to space exploration, and we're curious about life on other planets. But the cosmos also touches a deeper part of our psyches. Here are 10 reasons space exploration matters to you.

10 Plants Lost to History

science.howstuffworks.com/life/botany/10-plants-lost-to-history.htm

Are trees and shrubs as cute as pandas? As awe-inspiring as whales? Maybe not, but many are in danger of going the way of the dodo - just like countless leafy greens before them. Learn about some amazing plants we lost to history.

10 Most Long-lived Empires in History

history.howstuffworks.com/world-history/10-long-lived-empires.htm

Which historical empires lasted the longest? Read about the 10 most long-lived empires in history.

How the World Trade Center Slurry Wall Works

science.howstuffworks.com/engineering/structural/world-trade-center-slurry-wall.htm

It's been compared Jerusalem's Wailing Wall. What purpose did the slurry wall serve the World Trade Center, and what is its significance now?

The 10 Heaviest Buildings Ever Moved

science.howstuffworks.com/engineering/structural/heaviest-building-moved.htm

The five heaviest buildings ever moved rank high in the history of structural moving. Learn what those five heaviest buildings are.

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