Each of the events below occurred on the same day of the month, April 15.
1452: Painter, sculptor and architect Leonardo da Vinci is born in Florence, Italy.
1865: President Abraham Lincoln dies in Washington, D.C. at age 56.
1912: British passenger liner RMS Titanic sinks two hours and forty minutes after striking an iceberg in North Atlantic.
1923: Insulin becomes generally available to patients with Diabetes.
1947: Jackie Robinson makes his debut with the Brooklyn Dodgers, breaking baseball's color line.
1971: Beatles win Academy Award for Best Original Score Song, "Let It Be."
2013: Two bombs explode at finish line of Boston Marathon. Three people are killed and 264 are injured.