Ronnie and Donnie Galyon Ronnie and Donnie Galyon Ronnie and Donnie Galyon (born October 28, 1951) are American conjoined twins. According to the 2009 "Guinness World Records", the Galyons are the oldest living set of conjoined twins in the world, and, as of 29 October 2014, possess the world record for the longest-lived conjoined twins in history when they surpassed prior record holders Giacomo and Giovanni Battista Tocci. They were born at St. Elizabeth Hospital in Dayton, Ohio, on 28 October 1951, to Wesley and Eileen Galyon; Eileen was not expecting twins. They were joined from the sternum to the groin and shared a
There are known knowns management and strategic planning circles. Known unknowns refers to "risks you are aware of, such as cancelled flights..." Unknown unknowns are risks that come from situations that are so unexpected that they would not be considered. "For example, prior to the invention of the personal computer, manufacturers of typewriters probably didn't foresee the risks to their business". Contemporary usage is largely consistent with the earliest known usages. For example, the term was used in evidence given to the British Columbia Royal Commission of Inquiry into Uranium Mining in 1979: The term also appeared in a 1982 "New Yorker" article on