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During the late 1970s reports from endemically selenium deficient areas of China described two human diseases associated with severe nutritional selenium deficiency . The words " White " and " Black " are capitalized as proper adjectives in this Note because the author feels they most accurately describe two ethnic subsets in contemporary U.S. society . Mr. Steve Kracinovich , Vice Chairman of the St. Mary 's County Board of Education , described two general concerns that he has related to the Commission 's draft interim report . Troubled Passage , the fifth volume of the FAA 's self-published history , describes two such hijackings . Anna Pla-Dalmau , leader of PPD 's Scintillator Detector Development group , described two major challenges : " One was in controlling the cooling profile to avoid stresses which result in bowing of the strip .