1. On April 13, 1742, the town of Windham, Connecticut was incorporated. The town was named after Windham, England, and was originally part of the larger town of Lebanon until it became independent.

2. A significant event in Connecticut manufacturing history occurred on April 13, 1848, when the oldest surviving American locomotive built for commercial use, the John Bull, made its first test run on the Hartford and New Haven Railroad.

3. In 1875, on April 13, Connecticut Governor Charles Ingersoll signed an act establishing the State Agricultural Experiment Station. The facility was the first of its kind in the US and is still in operation today, located in New Haven.

4. On April 13, 1926, the Connecticut General Assembly voted to designate the white oak as the official state tree of Connecticut. This tree species is native to Connecticut and has strong connections to the state's history and culture.

5. In 1971, on April 13, Yale University announced that it would admit women to its undergraduate programs starting in the fall of that year. This decision came after years of student protests and calls for gender equality at the prestigious institution.