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RT @SmithsonianMag: Last week, Alaska Airlines became the first-ever commercial flight powered by a brand new wood-based biofuel. https://t… This tweet was posted on November 29, 2016.

RT @SmithsonianMag: Industrial salt production in the San Francisco Bay. #PhotoOfTheDay https://t.co/yJkh0x9Tik This tweet was posted on August 09, 2016.

RT @SmithsonianMag: The 1906 San Francisco quake in color. https://t.co/RjHrAeOHje This tweet was posted on April 18, 2016.

RT @SmithsonianMag: What are you flying over? This app will tell you. https://t.co/Cu8VfjfezK This tweet was posted on March 11, 2016.