Neuroscientists studying bilingual brains have discovered that a single region appears to handle grammar across multiple languages simultaneously. Rather than maintaining separate grammatical systems for each language, the brain seems to deploy one unified "grammatical engine" that can process the structural rules of Spanish, Mandarin, or English with equal efficiency. The finding, based on advanced imaging of bilingual speakers, challenges the long-held assumption that each language occupies its own neural real estate. Instead, it suggests the brain has evolved an elegant solution: one grammatical processor flexible enough to handle the syntax demands of any language a person speaks fluently.