4. Others who made the top ten include Amazon's Jeff Bezos at fifth on the list, Mark Zuckerberg of Facebook at sixth, Oracle's Larry Ellison at seventh, Michael Bloomberg at eighth, and tied for ninth are David and Charles Koch.
6. Armistice Day became an official U.S. holiday in 1938, and remained so until 1954, when it was renamed Veterans Day in the aftermath of both World War Two and the Korean War. It is separate from Memorial Day, which is observed on the last Monday in May and honors servicemen and women killed in war.