April 12

Happy Birthday RIP Johnnie Collier("Ann Miller" 1923–2004) Sir Charles Napier(1936–2011) Herbert Khaury("Tiny Tim" 1932–1996) Thomas Clancy Jr(1947–2013) ; Herbert Hancock–77 Edward O'Neill–71 David Letterman–70 David Cassidy–67 Thomas Noonan–66 Andrés "Andy" García Menéndez–61 Shannen Doherty–46 Nicholas Brendon Schultz–46 Claire Danes–38 Jennifer Morrison–38 ; 1945 – U.S. President Franklin D. Roosevelt dies in office; Vice President Harry Truman, becomes President upon Roosevelt's death ; 1955 – The polio vaccine, developed by Dr. Jonas Salk, is declared safe and effective