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Why Was 911 Chosen as the Emergency Phone Number?
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During an emergency, Americans know to dial 911 for help. How and why was that number selected as the emergency phone number for the entire country?
How does the sandpaper numbering system work?
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There are a number of different systems around the world for numbering the grades of sandpaper. Learn about how sandpaper numbering systems work from this article.
How Much Fuel Does an International Plane Use for a Trip?
science.howstuffworks.com/transport/flight/modern/question192.htm
Although the amount of fuel may seem high, when you do the math, it's actually not so bad.
Why is Uranium-235 ideal for nuclear power?
Nuclear plants provide the world with much of its electricity. Learn why Uranium-235 is ideal for nuclear power, in this article.
Fantastic Facts about the Human Body
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Take a look at these fantastic facts about the human body. Learn about fantastic facts about the human body from Discovery Health.
Organ Function Quiz
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Whether you're an amateur anatomy buff or a full-fledged medical professional, we challenge you to test your knowledge with this organ function quiz ... if you have the guts.
Earth's 20 Quadrillion Ants Outweigh All Wild Birds and Mammals, Combined
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Estimating ant numbers and mass provides an important baseline from which to monitor ant populations amid worrying environmental changes.
How Helium Balloons Work
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Helium balloons tend to fascinate adults and children alike (and it's not just the Donald Duck voice thing, though that is a big draw). Learn all about helium and why it floats!
Why has the World Trade Center memorial been delayed?
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Learn why, or whether, the WTC memorial project is behind schedule.
Frequency Formula Basics: 2 Ways to Calculate Frequency
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Frequency is a fundamental concept when you're talking about waves, whether that means electromagnetic waves like radio waves and visible light, or mechanical vibrations like sound waves.