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.
Where and when did the Wright Brothers' first flight take place? Orville and Wilbur Wright flew the first airplane on December 17,  1903, at Kill Devil Hills in North Carolina.The flight lasted 12  seconds.he first turbo jet flight took place on August 27, 1939 in  Germany. The jet was a Heinkel He 178 and the pilot's name was  Erich Warsitz.