Mr. Mistoffelees capable of performing feats of magic and sleight of hand. These traits are portrayed as amusing, not fearsome or particularly deadly. In "Cats", Mistoffelees is a principal role and maintains most of the same attributes as Eliot's original character, although he is much flashier. He has his own song and an extended dance solo in the second act of the show, and, in most productions, also sings the "Invitation to the Jellicle Ball" in the first act. In the original London Cast, Mistoffelees also sang "The Old Gumbie Cat"; and in the original Broadway production, he sang "Mungojerrie and Rumpleteazer".
What Engineers Know and How They Know It What Engineers Know and How They Know It What Engineers Know and How they Know It: Analytical Studies from Aeronautical History (The Johns Hopkins University Press, 1990) () is a historical reflection on engineering practice in US aeronautics from 1908 to 1953 written by an accomplished practitioner and instructor. This period represents the dawn of aviation which was fraught with uncertainties and numerous paths to many possible worlds. The book captures two main conclusions from this period. The first order conclusion of this book is about "what engineers know." Five case studies from the history of aeronautical engineering are used