Live Poll Results — Which revolutionary building material was first unveiled at the 1889 Paris World

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Which revolutionary building material was first unveiled at the 1889 Paris World's Fair, dramatically showcased in the structure that was the fair's entrance arch?

Poll Type: Trivia | Total Votes: 0

OptionVotesPercentage
{'choice_text': 'Reinforced concrete (Système Hennebique)', 'is_correct': False}00%
{'choice_text': 'Wrought iron (demonstrated in the Eiffel Tower)', 'is_correct': True}00%
{'choice_text': 'Laminated glass (Pilkington process)', 'is_correct': False}00%
{'choice_text': 'Aluminum curtain wall systems (Alcoa)', 'is_correct': False}00%