Abby and Brittany Hensel & Brittany" that started in August 2012. "Abby and Brittany: Joined for Life" was shown by the BBC in the UK in May 2013, and covers the period from their finishing college to starting a part-time teaching job. Documentaries and other television appearances include: Abby and Brittany Hensel Abigail Loraine Hensel and Brittany Lee Hensel (born March 7, 1990) are American dicephalic parapagus twins; also known as conjoined twins. They are highly symmetric for conjoined twins, giving the appearance of having a single body without marked variation from normal proportions. Each has a separate heart, stomach, spine, pair of lungs,
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