Leopold Aschenbrenner was hailed as the ‘Nostradamus of AI.’ But his Situational Awareness hedge fund took on too much leverage, leading to a crash he never saw coming.When the week began, Leopold Aschenbrenner was preparing for his wedding. The plan was for a multiday celebration in Carmel, a seaside town in Northern California, with the ceremony at a Tuscan-style villa and the send-off at a spa in the forest. There would also be a pre-wedding colloquium to discuss ideas in panels and breakout sessions. The couple’s only request: no gifts.The 24-year-old investor had amassed a fortune by promising he could...