1. On September 30, 1635, the first public school in America was established in Boston, Massachusetts. Although not directly related to Connecticut, the establishment of public schools in the United States had a significant impact on education throughout the country, including in Connecticut.

2. On September 30, 1780, the British spy John Andre was captured by American forces in Tarrytown, New York. Andre was found with incriminating documents revealing Benedict Arnold's plan to surrender West Point to the British. This event had a significant impact on the Revolutionary War and Connecticut's involvement in the conflict.

3. On September 30, 1844, the Hartford Courant became the first newspaper in the United States to publish an edition printed on a steam-powered press. This technological advancement revolutionized the newspaper industry and helped make the dissemination of news faster and more efficient.

4. On September 30, 1935, the Shepaug Dam was completed in Roxbury, Connecticut. The dam on the Housatonic River provides hydroelectric power to the area and helps to control flooding and erosion.

5. On September 30, 1962, the first nuclear-powered submarine, the USS Nautilus, visited Groton, Connecticut. The Nautilus had made history earlier that year by completing the first submerged voyage from the Pacific to the Atlantic Ocean via the North Pole. The submarine was built and launched by the Electric Boat Company in Groton.