1. On May 11, 1848, the Massachusetts Medical Society enacted a new policy allowing female physicians to become members for the first time. This was a significant step towards gender equality in the medical field.

2. The Massachusetts Institute of Technology (MIT) was founded on May 11, 1865. The school has since become one of the most prestigious universities in the world, known for its cutting-edge research and innovative technology.

3. On May 11, 1927, the Academy Awards were held in Hollywood, but a Massachusetts film won the top prize. "The Jazz Singer," which starred Al Jolson and was produced by Warner Bros., was named Best Picture in the very first Oscars ceremony.

4. In 1996, on May 11, the Massachusetts State House was designated a National Historic Landmark. Built in the 18th century, the State House is an icon of American history and government.

5. On May 11, 2012, the Boston Celtics defeated the Philadelphia 76ers in Game 7 of the Eastern Conference Semifinals. The Celtics went on to reach the NBA Finals that year, cementing their status as one of the most successful franchises in basketball history.