Many doctors believe this decline in hormone levels triggers the symptoms of PMS. Changes in brain chemicals or deficiencies in certain vitamins and minerals may also play a role. Too many salty foods, alcohol, or caffeine may make symptoms worse as well.
There have been countless flights made since the invention of the airplane by the Wright Brothers in 1903. It should come as no surprise that the first commercial flight in history occurred in the United States. In fact, it occurred on January 1, 1914, three years before the United States entered the first World War.
First Airplane Flight. The first successful flight of a powered airplane occurred at Kitty Hawk, North Carolina, on December 17, 1903. The plane's designers were Dayton residents Orville and Wilbur Wright, who until that point had made a living by building bicycles.