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http://architecture.about.com/od/skyscrapers/ig/World-s-Tallest-Buildings/Sears-Tower-.htm
Students calculated that if a ream of drawing paper is 4 inches tall, then one million sheets of paper would be 8000 inches tall. They then calculated that 8000 inches is 666 feet. If an average story in a building is 10 feet high that would be a 66 story building.
They then calculated that we would need 1000 of those buildings to represent a BILLION sheets of paper.
And! There are 6.6 billion people on the planet! Wow!
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