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.
It was on November 12, 1906, when Santos-Dumont flew a kite-like contraption with boxy wings called the 14-Bis some 722 feet (220 meters) on the outskirts of Paris. It being the first public flight in the world, he was hailed as the inventor of the airplane all over Europe. It was only later that the secretive Orville and Wilbur Wright proved they had beaten Santos-Dumont at Kitty Hawk, North Carolina, three years earlier on December 17.