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.
Some of them were carried by the winds many miles from Paris before they came down, and some of them were never heard of after leaving Paris. PILOT EARL OVINGTON receiving the first pouch of air mail letters ever flown in the US, September 23, 1911 from a Post Office official. In the year 1911 demonstrations of airplane mail service were made in India, England and the United States.