Isaac Arthur explores the concept of multiversal colonization, arguing that advanced civilizations might expand "sideways" into parallel realities rather than just outward across space. The episode details how to navigate and settle alternate universes, ranging from identical Earths to worlds with different physical laws, and introduces the "Omega Scale" for measuring civilizations that span multiple realities. Arthur discusses practical challenges like multiversal cartography, the risks of settling in "corpse worlds," and the shift in limiting factors from energy to information and access,…