Language Acquisition: Crash Course Linguistics #12 Learn On Youtube CrashCourse — September 19, 2025 · Comments off Source Link babbling biligualism child directed speech code switching Crash Course crashcourse critical period education Hank Green heritage language Jean Berko-Gleason John Green language language deprivation language transfer Lingthusiasm linguistics multilingualism one word phase overextending rules PBS two word phase vlogbrothers wug wug test
