From the ancient rock of Brazil, a Cretaceous snake fossil named Tametara mirim has emerged to quietly dismantle a century of assumptions about how serpents came to be. Scientists using micro-CT imaging found within its skull a brain unlike any known snake — neither primitive ancestor nor modern descendant, but something distinctly its own. The discovery, set alongside the already-known stem snake Dinilysia, reveals that early snakes were not converging on a single blueprint but diverging into radically different ways of life, some burrowing underground, others moving across the surface. Evolu