TODAY IN HISTORY ― MARCH 14

March 14 is the 73rd day of the year (74th in leap years) in the Gregorian calendar. There are 292 days remaining until the end of the year. This date is slightly more likely to fall on a Monday, Wednesday or Saturday (58 in 400 years each) than on Thursday or Friday (57), and slightly less likely to occur on a Tuesday or Sunday (56).

NATIONAL PI DAY 

44 BC – Casca and Cassius decide, on the night before the Assassination of Julius Caesar, that Mark Antony should remain alive.

1592 – Ultimate Pi Day (3.141592): the largest correspondence between calendar dates and significant digits of pi since the introduction of the Julian calendar.

1647 – Thirty Years' War: Bavaria, Cologne, France and Sweden sign the Truce of Ulm.

1780 – American Revolutionary War: Spanish forces capture Fort Charlotte in Mobile, Alabama, the last British frontier post capable of threatening New Orleans in Spanish Louisiana.

1794 – Eli Whitney is granted a patent for the cotton gin.

1900 – The Gold Standard Act is ratified, placing United States currency on the gold standard (just over $20.67 per Troy ounce).

1903 – The Hay–Herrán Treaty, granting the United States the right to build the Panama Canal, is ratified by the United States Senate. The Colombian Senate would later reject the treaty. The canal location would then be moved to Panama. The United States held control of the Canal Zone until the 1977 Torrijos–Carter Treaties provided for handover to Panama.

1915 – World War I: Cornered off the coast of Chile by the Royal Navy after fleeing the Battle of the Falkland Islands, the German light cruiser SMS Dresden is abandoned and scuttled by her crew.

1942 – Orvan Hess and John Bumstead became the first in the United States successfully to treat a patient, Anne Miller, using penicillin, derived from the Penicillium fungi.

1945 – World War II: The R.A.F.'s first operational use of the Grand Slam bomb, Bielefeld, Germany.

1951 – The Korean War: For the second time, United Nations troops recapture Seoul.

1964 – A jury in Dallas finds Jack Ruby guilty of killing Lee Harvey Oswald, the assumed assassin of John F. Kennedy.

1967 – The body of U.S. President John F. Kennedy is moved to a permanent burial place at Arlington National Cemetery.

1988 – Johnson South Reef Skirmish: Chinese forces defeat Vietnamese forces in Johnson South Reef, disputed Spratly Islands.

1995 – Space exploration: Astronaut Norman Thagard becomes the first American astronaut to ride to space on board a Russian launch vehicle. ― From NASA

2007 – The first World Math Day was celebrated. World Math Day involves participants playing 60 second games,with the platform heavily based on "Live Mathletics" found in Mathletics.

2008 – A series of riots, protests, and demonstrations erupt in Lhasa and elsewhere in Tibet. What originally began as an annual observance of Tibetan Uprising Day resulted in street protests by monks, that later descended into rioting, burning, looting, and killing by March 14.

BORN TODAY

1804 – Johann Strauss I, Austrian composer and conductor (d. 1849)

1833 – Lucy Hobbs Taylor, American dentist and educator (d. 1910)

1854 – Paul Ehrlich, German physician and biologist, Nobel Prize laureate (d. 1915)

1879 – Albert Einstein, German-American physicist, engineer, and academic, Nobel Prize laureate (d. 1955)

1920 – Hank Ketcham, American author and cartoonist, created Dennis the Menace (d. 2001)

1923 – Diane Arbus, American photographer (d. 1971)

1928 – Frank Borman, American colonel, pilot, and astronaut

1934 – Eugene Cernan, American captain, pilot, and astronaut (d. 2017)

From Wikipedia and Google (images), ex as noted.