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15 Largest Cities in Spain, Ranked by Population

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Spain — the fourth-largest European country by area with a population of about 47.3 million — is home to some of the continent's most vibrant cities.

Flying High: The Aircraft Quiz

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Manned flight has altered the course of humanity. How much do you know about the aircraft of the world? Take this quiz to find out.

Why DNA Evidence Can Be Unreliable

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DNA found at a crime scene doesn't automatically mean the person matching it is guilty, say researchers of new forensics guide.

Sagrada Familia Basilica Is Almost Finished, After 140 Years

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Started in 1882, this beautifully ornate church was the vision of architect Antoni Gaudí who conceived of it as a "forest in stone."

How the Mars Rovers Work

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Of course we want to go to Mars. Until we figure it out though, roving robots with names like Spirit, Opportunity, Sojourner and Curiosity are our best bet for digging up dirt on our nearest planetary neighbor. Want to go along for the ride?

How Greenhouses Work

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Reproducing plants out of season gave man a measure of control over nature. The allure of it sparked the imagination and inspired new methods for building structures devoted to plants. So how do greenhouses work?

Who Invented the Internet?

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At one time, sharing files between computers meant carrying a box of punch cards from one machine to another. The Internet changed all that, but who's responsible for creating this network of networks?

Is there a way to get solar energy at night?

science.howstuffworks.com/environmental/green-tech/energy-production/solar-energy-night.htm

Getting solar energy at night is one of the major problems with solar energy. Learn about getting solar energy at night.

Maillardet's Automaton Is a Marvel of 19th-century Robotics

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Maillardet's Automaton, built around 1800, can write poems and draw pictures and was a precursor to today's sophisticated robots.

Could an Attack on Undersea Cables Take Down the Internet?

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Much of the infrastructure that makes the internet possible lies on the bottom of the world's oceans. HowStuffWorks dives down to check them out.

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