https://en.wikipedia.org/wiki/Flat_roof
http://www.bbc.com/news/world-middle-east-14437334
http://www.discoverychannel.com.au/images/the-history-of-skyscrapers/
http://gurumagazine.org/askaguru/skyscrapers-fall-heavy-wind/
http://science.howstuffworks.com/engineering/structural/skyscraper4.htm
https://en.wikipedia.org/wiki/Tube_%28structure%29
http://www.infoplease.com/spot/skyscraperhistory.html
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