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How CAT Scans Work
science.howstuffworks.com/cat-scan.htm
CAT scans take X-ray imaging to a whole new level. Find out how a CAT scan machine uses "slices" to form a 3-D computer model of a patient's insides.
National Yo-Yo Day
people.howstuffworks.com/culture-traditions/holidays-other/national-yo-yo-day.htm
Yo-yos can be traced back at least 2,500 years -- it's a toy with phenomenal staying power. On June 6, yo-yo fans everywhere can "walk the dog" to commemorate the birthday of Donald Duncan, credited with making yo-yos popular in the United States.
What Happens When a Keystone Species Goes Extinct?
science.howstuffworks.com/environmental/conservation/issues/keystone-species-extinct.htm
Keystone species in an ecosystem function much like a keystone in an arch. Without them the structure collapses. Learn about keystone species.
Is Greenland Part of North America? Geologically, Yes
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Greenland is one of the most unique places on Earth, and it often sparks a big geographical question: Is Greenland part of North America?
1950-1959 Cadillac
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The 1950-1959 Cadillac models expressed America's postwar prosperity and ambition. Learn about the Cadillacs of the '50s.
How Much Do You Know About Martial Arts?
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Martial artists have been punching, kicking and wrestling for many years. But how much do you know about the legendary fighting styles practiced by these artists? Put on your gi, tie up your belt and get ready to do battle against our challenging martial arts quiz to find out.
10 Incredible Wind Power Facts
science.howstuffworks.com/environmental/green-science/10-wind-power-facts.htm
In the race to find alternative energy sources, wind power is a strong contender. In fact, it's already making its mark. How much do you know about this up-and-coming energy source?
How Marijuana Works
science.howstuffworks.com/marijuana.htm
Marijuana isn't just a recreational drug for hippies and philosophy majors -- its psychoactive history ranges from Egyptian mummies to modern U.S. politics. What's the big deal about this leafy, green plant?
10 Strange Structural Engineering Marvels
science.howstuffworks.com/engineering/structural/10-strange-structural-engineering-marvels.htm
Some architects and engineers go big. Others get fancy. And yet others aim squarely for the completely bizarre. These imagination-bending, gravity-defying products may induce more than a few OMGs.
How Gypsies Work
people.howstuffworks.com/gypsy.htm
Who are the gypsies? Movies and books often portray gypsies as fortune tellers and beggars, but what's the real story? Read about gypsies at HowStuffWorks.