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  1. ECH - Escher Tower

    03:43

    from BIG / Added

    12.3K Plays / / 6 Comments

    Above a certain height the primary structural challenge of a tower shifts from gravity loads to wind loads, from vertical to horizontal stress. As a result, most skyscrapers are built like thick columns…

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    • Building Green Skyscrapers

      02:50

      from Energy NOW / Added

      198 Plays / / 0 Comments

      Commercial buildings account for almost 20 percent of the nation's energy use and more than one-third of its greenhouse gas emissions. In this installment of Energy 101, Correspondent Lee Patrick…

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