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What Are Mines?

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Underground mining has come a long way from the days of men with pickaxes and canaries. It relies much more heavily on machinery that makes it much safer than in the past. Which techniques are used in mining today?

What Are Moonmoons?

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What are moonmoons? HowStuffWorks looks at the moons of moons.

What Are Prime Numbers, and Why Do They Matter?

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You may remember from math class that a prime number is a number that can only be divided by 1 and itself. But why are they important anyway?

What Are Santa Ana Winds?

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These annual winds blow during Southern California's dangerous dry season, whipping up wildfires that can ravage thousands of acres.

What Are Single-use Plastics and Should They Be Banned?

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China has joined the more than 120 countries outlawing certain types of single-use plastics, those convenient but controversial plastics we've all become so used to. What exactly are they, though, and is banning them really necessary?

What Are Skyquakes?

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Skyquakes have been heard in the U.S. and all over the world. HowStuffWorks looks into the mystery.

What Are UFOs? Select Theories and Shifting Scientific Stances

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What are UFOs, and are UFOs real? Learn about UFOs in this article from HowStuffWorks.

What Are the 10 Biggest Airports in the World?

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Ever sprinted through one of these behemoth airports desperate to make a flight? Here are the world's seven largest airports, not by passenger volume, but by sheer size alone.

What Are the 10 Worst Torture Methods and Why?

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The most prevalent forms of torture have been identified in a book by the CODESRIA organization. Learn about the most prevalent forms of torture.

What Are the 17 Symptoms of PTSD?

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Post-traumatic stress disorder was first described by a doctor treating patients during the Civil War. Learn about post-traumatic stress disorder.