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spec: In 1912 , American inventor Lee deForest took the vacuum tube concept a step further . Speakers include garden historians Davyd Foard Hood of North Carolina and Wesley Greene of Colonial Williamsburg ; Joel T. Fry , Curator of Bartram ’ s Garden ; William Paca Garden ’ s horticulturist Mollie Ridout ; and rosarian Douglas T. Seidel . ”  Joseph T. Skerrett Jr ., editor of Literature , Race , and Ethnicity : Contesting American Identities Contributors include Mary Jo Bona , Sarika Chandra , Kristin Czarnecki , Aureliano Maria DeSoto , Patricia Keefe Durso , June Dwyer , Joe Kraus , John Lowe , Irma Maini , Veronica Makowsky , Stephen Spencer , and Wenying Xu . Daniel T. Stetson , president and chief executive officer , Ocean Institute . No , T. was still there when they won the command and control job . The study says boys are more likely than girls to have their own computers and to attend computer camps , and even the time boys spend playing computer games makes them more comfortable with technology . In an article about General Motors and tracking stocks , Matthew T. Billett , an assistant professor of finance at the UI who has studied tracking stocks , said that many companies that have eliminated tracking stocks have pointed to the advantages of a simplified capital structure . Though we occupy the lowest place of this kingdom , the mere suburbs of the heavenly city , still we are in it . Fluent 's software is used for simulation , visualization , and analysis of fluid flow , heat and mass transfer , and chemical reactions .