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Babel no more : the search for the world's most extraordinary language… (edition 2012)
Babel No More: The Search for the World's Most Extraordinary Language Learners by Michael Erard
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Assesses historical "hyperpolyglot" linguistic high achievers who demonstrated an extraordinary capacity for learning and speaking languages, and explains the sources of such abilities and what it reveals about the nature of memory and language.
(summary from another edition)