The question considered hereâhow does population growth affect the direction. and magnitude of economic change today as world population approaches 6 billionâis. germane to a key argument invoked to defend international population assistance. programs since their inception in the early 1960s.
Late June-July 1971: Nixon Authorizes âPlumbers,â Orders Media Leaks to Smear Ellsberg. President Nixon authorizes the creation of a âspecial investigations unit,â later nicknamed the âPlumbers,â to root out and seal media leaks.
History of Plumber Tape. â¢ 1938 â Dr. Roy Plunkett, a DuPont scientist, discovered polytetrafluoroethylene (PTFE). â¢ 1946 â DuPont registers the trademark, Teflonâ¢ for PTFE. â¢ Late 1940s â DuPont began marketing PTFE on a small scale for certain industrial applications, including valves, o-rings, and pipe linings. â¢ 1969 â DuPont PTFE fine powder is used for plumber tape for sealing joints in piping and central heating systems.