Roentgen equivalent man has been defined since 1976 as equal to 0.01 sievert, which is the more commonly used SI unit outside the United States. A number of earlier definitions going back to 1945 were derived from the roentgen unit, which was named after Wilhelm Röntgen, a German scientist who discovered X-rays. The acronym is now a misleading historical artifact, since 1 roentgen actually deposits about 0.96 rem in soft biological tissue, when all weighting factors equal unity. Older units of rem following other definitions are up to 17% smaller than the modern rem. One rem carries with it a 0.05% chance of
The Invention of Art of human expression and embellishment. Reviewer Marc Spiegler called the book "a must-read for anyone active in the arts". The Invention of Art The Invention of Art: A Cultural History (2001) is an art history book by Dr. Larry Shiner (1934- ), Emeritus Professor of Philosophy, History, and Visual Arts at the University of Illinois, Springfield Shiner spent over a decade to finish the work of this book. The book sees fine art as a modern invention due to social transformations during the 18th century. David Clowney, writing for "Contemporary Aesthetics" summarizes the central thesis of this book. "In The