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How Does the U.S. Classify Its Most Sensitive Documents?

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There are three levels of security classification for U.S. documents related to national security. What are they and who decides how they're protected against unauthorized disclosure?

What Is the Birthday Paradox?

science.howstuffworks.com/math-concepts/birthday-paradox.htm

How large does a random group of people have to be for a 50 percent chance to exist that at least two of the people will share a birthday?

Is Borax Harmful or Helpful?

science.howstuffworks.com/borax-harmful-or-helpful.htm

Borax, a popular addition to laundry detergents and slime recipes, is a natural ingredient that has been getting flack for possibly being harmful to children. But is this true?

Can You Guess If It's a Taylor Swift Lyric or a Line of Poetry?

play.howstuffworks.com/quiz/can-you-guess-if-its-a-taylor-swift-lyric-or-a-line-of-poetry

"Swift Things Are Beautiful," at least according to poet Elizabeth Coatsworth. Can you tell the difference between these Taylor Swift lyrics and lines of poetry? Hum the words or picture them in a book; just pick the songs and the sonnets!

How Are Computers Made?

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Interested to know how computers are made? We'll take a peek at the parts and processes that create computers and explore how computers are made.

How Fly Ash Concrete Works

home.howstuffworks.com/home-improvement/construction/materials/fly-ash-concrete.htm

Fly ash concrete is considered a green building product. Learn about the benefits and potential hazards of fly ash concrete.

How Flavor Enhancers Work

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Flavor enhancers can brighten the flavors of almost any food. Learn how flavor enhancers change how food tastes.

Can You Correctly ID These Common Pieces of Construction Equipment?

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Can you differentiate between a Phillips screwdriver and a flathead? Do you know what a crawler-loader is? If so, this is the quiz for you! Test your knowledge of all different types of construction site equipment with this ultimate challenge!

Can You Complete These Disney Song Lyrics?

play.howstuffworks.com/quiz/can-you-complete-these-disney-song-lyrics

See how many of the lyrics to these Disney tunes you can recall. If you say them loud enough, you'll always sound precocious! Time to put on your singing cap.

How Biofilm Works

science.howstuffworks.com/life/cellular-microscopic/biofilm.htm

Biofilms form when single microorganisms attach to a hydrated surface and undergo a "lifestyle switch." Learn about biofilms in this article.

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