In the quiet geometry of a petri dish, MIT researchers Sergio Eraso and Mehran Kardar have discovered that where a population begins its journey may matter as much as how well it is equipped for the journey itself. By wedding a physicist's equation for jagged, spreading flames with a biologist's model of evolutionary competition, they have shown that expansion speed and spatial position shape the fate of competing populations alongside fitness — sometimes overriding it entirely. The finding, published in the Journal of Statistical Mechanics, invites us to reconsider a foundational assumption o