["HISTORY \/ World","LANGUAGE ARTS & DISCIPLINES \/ Linguistics \/ General","LANGUAGE ARTS & DISCIPLINES \/ Literacy","LANGUAGE ARTS & DISCIPLINES \/ Speech & Pronunciation","Language and languages;Study and teaching.","Linguistics;History.","Multilingualism.","GENERAL","General Adult","HISTORY \/ World","LANGUAGE ACQUISITION","LANGUAGE ARTS & DISCIPLINES \/ Linguistics \/ General","LANGUAGE ARTS & DISCIPLINES \/ Literacy","LANGUAGE ARTS & DISCIPLINES \/ Speech & Pronunciation","Language","Language acquisition; Linguistics; polyglots; Language skills; learning new languages; hyperpolyglots","Language and languages;Study and teaching.","Linguistics;History.","Multilingualism.","Non-Fiction","United States"]