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What Is Pi?
science.howstuffworks.com/math-concepts/pi.htm
Whether the circle is as big as planet Mars or as small as a tennis ball, the ratio of its circumference divided by its diameter will always equal pi (3.14). But why?
Are redheads going extinct?
science.howstuffworks.com/life/genetic/redhead-extinction.htm
Redhead extinction is the idea that the recessive gene that causes red hair will eventually die out. Read about the theories behind redhead extinction.
Science Projects for Kids: Current Electricity
Get a charge out of these exciting science projects for kids as you discover the world of ion attraction. Begin with these electrifying activities.
Science Projects for Kids: Producing Sounds
lifestyle.howstuffworks.com/crafts/science-projects/science-projects-for-kids-producing-sounds.htm
With Science Projects for Kids: Producing Sounds you'll discover why and how sound happens. Join us and have lots of fun while you're learning.
1954 Mercury Sun Valley
auto.howstuffworks.com/1954-mercury-sun-valley.htm
The 1954 Mercury Sun Valley featured a plastic see-through roof for ultimate visibility. See pictures and a profile of the 1954 Mercury Sun Valley.
Why Is Yawning Contagious?
science.howstuffworks.com/life/inside-the-mind/human-brain/contagious-yawn.htm
Contagious yawning is associated with the same parts of the brain that deal with empathy, according to a recent study. Learn about contagious yawning.
Venus: Earth's Blazing-hot and Bizarre Twin
science.howstuffworks.com/46009-venus-explained.htm
The atmosphere is crushing on Venus, and it's so hot lead would melt. But the planet still has a lot in common with Earth. We'll explain.
How the New $20 Bill Works
money.howstuffworks.com/new-twenty.htm
With the introduction of the new $20 bill, the U.S. Treasury has introduced a whole new element to the dollar: color. Learn about the new look of the currency and about the benefits of the new features.
How to Play Klaberjass
entertainment.howstuffworks.com/how-to-play-klaberjass.htm
Probably Hungarian in origin, this card game became a favorite for gamblers in the United States as a one-on-one test of talent. Learn the rules.
What's a prehistoric toolkit and how could it rewrite human history?
science.howstuffworks.com/life/evolution/prehistoric-toolkit.htm
A prehistoric toolkit is a set of tools that early humans utilized. Learn about a prehistoric toolkit in this article from HowStuffWorks.