1790 – US Patent system forms.
1841 – New York Tribune begins publishing under editor Horace Greeley.
1849 – Safety pin patented by Walter Hunt (NYC); sold rights for $400.
1869 – Congress increases number of Supreme Court judges from 7 to 9.
1872 – 1st Arbor Day celebrated in Nebraska, later changed to April 22.
1913 – Walter Johnson begins string of 56 consecutive scoreless innings.
1916 – 1st professional golf tournament held.
1924 – Tubular steel golf club shafts approved for championship play.
1938 – NY makes syphilis test mandatory in order to get a marriage license.
1945 – NFL’s Boston Yanks & Brooklyn Tigers merge.
1945 – US troops land on Tsugen Shima Okinawa.
1955 – Dr. Jonas Salk successfully tests Polio vaccine.
1961 – 25th Masters Golf Tournament: Gary Player wins, shooting a 280.
1968 – 40th Academy Awards – “In the Heat of the Night”, Rod Steiger & Katherine Hepburn win.
1970 – Paul McCartney officially announces the split of The Beatles.
1977 – 41st Masters Golf Tournament: Tom Watson wins, shooting a 276.
1989 – 24th Academy of Country Music Awards: Hank Williams, Jr., George Strait, and K.T. Oslin win.
1995 – NYC bans smoking in all restaurants that seat 35 or more.
2005 – 69th Masters Golf Tournament: Tiger Woods wins, shooting a 276.
2012 – Apple Inc. claims a value of $600 billion making it the largest company by market capitalization in the world.
2012 – Rick Santorum suspends his candidacy for the Republican Presidential nomination making Mitt Romney the overwhelming favorite.