On 2 September 2013, Diana Nyad completed the first unassisted open-water swim from Cuba to Florida at age 64, covering 177 kilometres in 53 hours through shark-infested waters and jellyfish blooms. The same date in 1752 marked Britain’s adoption of the Gregorian calendar, when eleven days simply vanished overnight as the country corrected centuries of accumulated timekeeping error. In 2006, a Siemens locomotive set a world speed record for conventional electric trains at 357 kilometres per hour on German track. And in 1649, Pope Innocent X ordered the complete destruction of the Italian city of Castro, razing it stone by stone and salting the ground. Four stories of human determination, administrative boldness, engineering ambition, and papal fury, all sharing a September date.