1. In 1919, a Boston molasses tank exploded, killing 21 people and injuring 150 more. The tank, owned by the Purity Distilling Company, had been filled with over 2 million gallons of molasses, which burst through the walls and flooded the streets, causing significant damage to homes and buildings.

2. On January 15, 1777, the Continental Army under the command of General George Washington defeated British forces at the Battle of Princeton, one of the pivotal battles of the American Revolution. The American victory at Princeton helped to boost morale and confidence in the fledgling army.

3. In 1967, the first Super Bowl was played at the Los Angeles Coliseum, with the Green Bay Packers defeating the Kansas City Chiefs 35-10. However, the game was also significant for Massachusetts, as Holy Cross graduate Tom Matte became the first player to score two touchdowns in a Super Bowl.

4. On January 15, 1844, the Massachusetts Horticultural Society was founded in Boston. The organization, which still exists today, promotes the art and science of horticulture, and has played a significant role in the cultivation and preservation of various plant species in the state.

5. In 1973, the Supreme Court of Massachusetts ruled that the state's ban on interracial marriage was unconstitutional, overturning a law that had been in place since the colonial era. The ruling helped to pave the way for marriage equality and civil rights for all citizens in the state.