1652 – John Johnson, a free African American, is granted 550 acres in Northampton, Virginia.
1752 – Benjamin Franklin tests the lightning conductor with his kite-flying experiment.
1775 – Second Continental Congress convenes in Philadelphia, names George Washington Supreme Commander and issues paper currency for the 1st time.
1797 – 1st US Navy ship, the “United States,” is launched.
1823 – 1st steamboat to navigate the Mississippi river arrives at Ft. Snelling.
1908 – 1st Mother’s Day observed (Philadelphia).
1924 – J.. Edgar Hoover appointed head of FBI.
1930 – 1st US planetarium opens (Adler-Chicago).
1941 – 66th Preakness: Eddie Arcaro aboard Whirlaway wins in 1:58.8.
1960 – John F. Kennedy wins primary in West Virginia.
1963 – Decca signs Rolling Stones on advice of Beatle George Harrison.
1966 – 25 degrees (F) lowest temperature ever recorded in Cleveland in May.
1968 – Vietnam peace talks began in Paris between the US & North Vietnam.
1970 – Braves Hoyt Wilhelm pitches in his 1,000th game, loses to Cards 6-5.
1981 – Amy Alcott wins LPGA Lady Michelob Golf Tournament.
1983 – “Laverne & Shirley” last airs on ABC-TV.
1993 – Bill Walton is inducted into the Naismith Memorial Basketball Hall of Fame.
1994 – Barbra Streisand begins 1st concert tour in 30 years.
2005 – A hand grenade which was thrown by Vladimir Arutyunian lands about 65 feet from US President George W. Bush while he was giving a speech to a crowd in Tbilisi, Georgia, but it malfunctions and does not detonate.
2016 – Indian fertility clinic announces that a 70 year old woman has successfully gave birth to a baby boy.