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Technology 1900-1919 1900-Paris Metro Opened 1900-Freud Publishes 1900-US Navy Accepts Submarine 1900-Quantum Theory Published 1900-Escalator Introduced at Paris Expo 1900-First Zeppelin Developed 1901-Mosquitos Cause Yellow Fever 1901-Trans-Siberian Railroad Completed 1903-First Message Sent Over Pacific Cable 1903-Wright Flyer Flies 1904-NY Subway Opens 1905-Theory of Relativity Published 1906-First Powered Flight in Europe 1906-Wasserman Test Developed 1906-Simplon Tunnel Opened 1907-First Helicopter Flies 1907-Mauritania Launched 1907-Montessori School Introduced 1908-First True Skyscraper Built 1908-First Passenger Killed 1909-First Newsreel Shown in Theaters 1909-English Channel is Crossed 1911-First Landing on Ship 1911-First Coast-to-Coast US Flight 1913-Ford Begins First Moving Assembly Line 1913-First Home Electric Refrigerator 1915-First Transcontinental Telephone Conversation 1918-Air Mail Service Begun 1919-US Seaplanes Cross the Atlantic