This episode explores the historical events of September 1st, a day marked by both global conflicts and scientific breakthroughs. The sources recount the start of World War II in 1939 with Germany's invasion of Poland, as well as the publication of the Oppenheimer–Snyder model, which provided the first contemporary physics proof of the development of black holes. The episode also highlights other events like the 1923 Great Kantō earthquake, which devastated Tokyo and Yokohama, resulting in the deaths of approximately 105,000 people. September 1st also marks the anniversaries of the Beslan school siege in 2004 and the US transfer of control of Anbar Province to Iraqi forces in 2008. Join us as we remember these events and their lasting impacts.