The most popular system is run on smartphones and it is android.
The promoter of the golden mean (golden ratio) is Dr. George Markowsky. He wrote a article about the "Misconception of the golden ratio.
I think Macarthur chose Inchon as a landing place because <span>cause it was the last city the north Koreans had to invade before they could take over Seoul, south koreas capital.
Because of this, he considered Inchon as the most perfect place for the American army to settle their troops. (in order to reduce as much casualties as possible)</span>