This episode explores the historical significance of September 15th, spanning centuries of global events. Listeners will learn about the birth of Marco Polo, the Italian merchant and explorer, in 1254, as well as the dramatic climax of the Battle of Britain in 1940. The episode also covers a range of topics from the first use of tanks in battle in 1916 to the opening of the Liverpool to Manchester railway line in 1830. September 15th marks significant anniversaries for many countries including Independence Day for five Central American nations and the celebration of Engineer's Day in India.