Imagine a world where 99.9% of the global population has vanished overnight. This scenario, once confined to the realms of science fiction and prophecy, has been a recurring theme in human thought and art. It's a question that has captivated minds for centuries, from the biblical flood narrative to Mary Shelley's "The Last Man." But what would such a world look like, and how would the remaining 0.1% strive to rebuild civilization?