A pretty boring material to most but awesome in results.

The first skyscraper using reinforced concrete was not built until 1903. It was a 16 story building in Cincinnati and it took 2 years to get the permit because of the doubt of the viability of concrete. In 1998 the Petronas towers in Malaysia became the first concrete skyscrapers to become the tallest buildings in the world. In 2003 a steel building took the title, In 2009 the Burj Khalifa in Dubai again made the worlds tallest building a concrete structure, a title is still holds to this day.

(The Great Courses – Understanding the World’s Greatest Structures)

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