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What Color Is the Hottest Flame?
science.howstuffworks.com/what-color-is-the-hottest-flame.htm
Flame colors span a spectrum that tells a tale as old as fire itself. Many people wonder what color is the hottest flame; more than a testament to the natural fascination with fire's beauty, this question underscores a fundamental principle in the science of thermodynamics and combustion.
How Kaleidoscopes Work
science.howstuffworks.com/kaleidoscope.htm
Kaleidoscopes have been fascinating people since the early 19th century. Whether you think of kaleidoscopes as toys or as works of art, no matter how often you look inside, you'll never see the same thing twice.
Can You Match These Female Action Heroes to Their Movies?
play.howstuffworks.com/quiz/can-you-match-these-female-action-heroes-to-their-movies
People used to say girls are made from sugar and spice and everything nice. These women are made from power, strength and serious butt-kicking heroism. How many female action heroes can you ID? Take the quiz and see!
Pump It Up! Heart Health Quiz
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The heart is a pump, and like other pumps, break down and need repair. And it does break down for many people -- heart disease is the leading cause of death in the United States. How much do you know about the dangers that threaten it?
Why do you have to turn your phone on at airport security?
Going through airport security is the worst part of flying for most people. Now you may be asked to turn your cell phone on in the security line. Why do you have to do that? And does it really keep us safe?
Do You Know How to Drive a Manual?
play.howstuffworks.com/quiz/do-you-know-how-to-drive-a-manual
Back in the day, driving stick was a more popular option for cars. But nowadays, most people drive automatic. Do you have enough know-how about driving a car with manual transmission? Well, fasten your seatbelt and take this quiz!
Which Time Period Should You Have Been Born In?
play.howstuffworks.com/quiz/which-time-period-should-you-have-been-born
Are you one of those people who think, "I was born in the wrong time" when something crazy happens? If so, we've got a quiz for you. Take it to figure out what time period you should belong in.
The Infamous Cults Quiz
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Some cults promote harsh conservative judgment; some are more into free love and spaceships. Others are incredibly dangerous, harming their own members and innocent people. With this quiz, we'll see how much you really know about infamous cults.
Do You Know the Meaning of These Common Acronyms?
play.howstuffworks.com/quiz/do-you-know-the-meaning-these-common-acronyms-learn
Life is short! One way that people try to save time is by using acronyms. But acronyms don't help very much if you don't understand what they stand for. So test your knowledge of them now with our quiz!
What if everyone on Earth jumped at the same time?
science.howstuffworks.com/science-vs-myth/what-if/what-if-everyone-on-earth-jumped-at-same-time.htm
The Earth is a pretty stalwart planet, having survived billions of years of punishment at the hands of asteroids and other cosmic bodies. But could it withstand more than 7 billion people jumping up and down in unison? Do we even want to find out?