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What caused the World Trade Center towers to collapse on 9/11?
science.howstuffworks.com/engineering/structural/cause-world-trade-center-collapse.htm
It took years to construct the 110-story World Trade Center towers and less than an hour to bring them down to rubble. What ultimately caused the towers to collapse on Sept. 11, 2001?
Did You Know There Are 23 Countries in North America?
history.howstuffworks.com/north-american-history/countries-in-north-america.htm
North America is the world's third largest continent by land area, bordered by the Arctic Ocean to the north, the Atlantic Ocean to the east, the Pacific Ocean to the west, and South America and the Caribbean Sea to the south. This incredible size means there are quite a few countries in North America.
10 Critical Pieces of Motorcycle Body Armor
What are the most important kinds of motorcycle body armor? Read about 10 critical pieces of motorcycle body armor at HowStuffWorks.
What Part of the Brain Controls Emotions?
Don't think of emotions as just "feelings." They're also the product of how your brain processes your feelings and how you respond to them.
What is optical audio?
electronics.howstuffworks.com/gadgets/audio-music/optical-audio.htm
Optical audio offers a new way to send audio and video from your gear to your ear. Learn how optical audio works.
The Longest Home Runs Ever Hit
entertainment.howstuffworks.com/the-15-longest-home-runs-ever-hit.htm
Ranking the longest home runs ever hit is trickier than you might expect. Technology simplifies today's measurements, but it was a different story before 2015.
Can You Identify These '50s Cars from a Black and White Photo?
play.howstuffworks.com/quiz/can-you-identify-these-50s-cars-a-black-white-photo
Cars from the 1950s are difficult to identify as it is but let's make it a little tougher by only showing them in black and white!
Can You Identify These Chevy Cars From the '80s?
play.howstuffworks.com/quiz/can-you-identify-these-chevy-cars-the-80s
A true American classic, you would be surprised as to how many Chevrolet models were available overseas and not in the United States. Let's see if you can identify them!
Can You Name These Unpopular Cars From the '70s?
play.howstuffworks.com/quiz/can-you-name-these-unpopular-cars-from-70s
From cars with engines known for bursting into flames to vehicles that were downright ugly, the '70s wasn't exact the peak of automotive design. Think you can name some of the biggest head-scratchers, flops and failures of the decade? Take our quiz to find out!
Can You Name All These Famous Bollywood Stars?
play.howstuffworks.com/quiz/can-you-name-all-these-famous-bollywood-stars
If you love romance and music, you love Bollywood movies. The colorful dance numbers will have you singing along in spite of yourself. How much of a Bollywood buff are you? Take our quiz and see!