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A deaf 2-year-old receives a cochlear implant — years of therapy follow, speech emerges. Cochlear implant (electrode array in cochlea → stimulates auditory nerve directly, bypassing dead hair cells): candidacy — bilateral profound sensorineural loss with minimal hearing-aid benefit; children implanted <2–3 years (before the language window closes) develop near-normal speech with intensive auditory-verbal therapy. Adults (post-lingual) regain sound awareness. The implant is hardware — therapy is the software; both take years. Early is everything — the brain's language window waits for no one.