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What are the stages of emphysema?
health.howstuffworks.com/diseases-conditions/respiratory/stages-of-emphysema.htm
There are four stages of emphysema. Learn more about the stages of emphysema by reading this article.
Rhombus Properties and Perimeter Formula
science.howstuffworks.com/math-concepts/rhombus.htm
A rhombus is a parallelogram shape with two pairs of parallel sides and four equal sides. These four sides of equal length also define the rhombus as an equilateral quadrilateral. Etymologically, the name of this shape stems from the Greek word "rhombos," which roughly translates to "spinning top."
What the Stuff?!: 4 Strange and Creepy Islands
www.howstuffworks.com/videos/what-the-stuff/what-the-stuff-strange-islands-video.htm
There's nothing cooler than a weird, mysterious island. Here are four of the strangest islands on planet Earth.
How Do You Sleep When Sailing Solo for 4,000 Miles?
health.howstuffworks.com/mental-health/sleep/disorders/sleep-when-sailing-solo-4000-miles.htm
Four weeks and 4,000 miles is a long time to get by on catnaps during a solo sailing race.
Do You Know the Leap Year These Historical Events Happened?
play.howstuffworks.com/quiz/do-you-know-the-leap-year-these-historical-events-happened
What comes along once every four years and is a real downer for salaried workers? It's leap year! While this one day may not hold a ton of historical significance, the year it represents certainly does. Can you identify the important events or moments in these years divisible by four?
Determining Supplement Quality
Determining supplement quality is important for your health and nutrition. Learn about the four grades determining supplement quality.
Cottonmouth: Snake With Potent Venom and Catlike Eyes
animals.howstuffworks.com/snakes/water-moccasin-cottonmouth.htm
Cottonmouth snakes are often called water moccasins and are one of only four venomous snakes found in North America.
How does a Crookes' radiometer work?
science.howstuffworks.com/question239.htm
I once saw this device shaped like a light bulb. It had a vertical support inside it, and on that support there were four vanes with four diamonds on the end. One side of the diamond was black and the other was white. I did a little research and found out that it was called a Crookes' radiometer -- how does it work?
What the Stuff?!: 4 Mad Royals in History
www.howstuffworks.com/videos/what-the-stuff/what-the-stuff-mad-royals-video.htm
Absolute power and mental illness make a strikingly bad combination. Learn about four monarchs who went insane.
Why are boogers sticky?
health.howstuffworks.com/human-body/systems/nose-throat/question81.htm
My four-year-old asked, "Why are boogers sticky?" I really didn't know what to say...