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8 Most Densely Populated Cities in the World

history.howstuffworks.com/world-history/most-densely-populated-city.htm

Statistically, over half of the people reading this article live in a city, with a higher population density than rural or suburban areas. For instance, New York City has nearly 27,000 people crammed into each square mile (2.6 square km) of land.

9 Deep-diving Facts About the Lands of Oceania

history.howstuffworks.com/world-history/oceania.htm

Fourteen countries and 39 million square miles make up Oceania in the South Pacific. And bungee jumping was invented there, too.

How Do Grades of Sandpaper Grit Differ?

home.howstuffworks.com/difference-between-grits-sandpaper.htm

Sandpaper is measured by grit size - the number of sharp particles per square inch. Learn more about the different grits of sandpaper.

Why Are Airplane Windows Round?

science.howstuffworks.com/transport/flight/modern/airplane-windows-round.htm

The first commercial jetliners had square windows. So why did engineers change the design to the rounded windows we know today?

What Are Imaginary Numbers?

science.howstuffworks.com/math-concepts/imaginary-numbers.htm

An imaginary number is a value that's the square root of a negative number. It can't exist on a one-dimensional number line. We'll explain.

Can You Dig It? If You're a Badger, You Can

animals.howstuffworks.com/mammals/badgers.htm

Badgers love to dig - one den, or "sett," in southern England is thought to cover a territory of over a square mile and have up to 100 entrances.

1966 Suzuki T10

auto.howstuffworks.com/1966-suzuki-t10.htm

The 1966 Suzuki T10 motorcycle, with its mild-mannered engine, was aimed squarely at commuters. See pictures and learn about the Suzuki T10.

How Hopscotch Works

entertainment.howstuffworks.com/backyard-fun-games/hopscotch.htm

Throw your marker, jump to your square. Hopscotch has simple rules, but many variations. Find out about the ancient game still vogue on playgrounds.

1961-1962 Buick Electra

auto.howstuffworks.com/1961-1962-buick-electra.htm

The 1961-1962 Buick Electra got a square, clean, modern body, but kept the 401-cid Wildcat 445. Learn about this new generation of intermediate Buicks.

What Is a Good Thread Count for Sheets?

home.howstuffworks.com/home-decor/bedroom/thread-count.htm

Thread count means the number of threads woven together in a square inch. Find out what that really means and if we're being tricked by thread count.

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