As Greenberg worked on classifying the languages of the Americas, he realized that they must be related in some way to languages on the Eurasian continent, if indeed the Americas had been inhabited by people migrating from Siberia. So to help with the American classification, he started making lists of words in languages of the Eurasian land mass, particularly personal pronouns and interrogative pronouns. "I began to see when I lined these up that there is a whole group of languages through northern Asia," he said in an interview in 1999. "I must have noticed this 20 years ago. But I realized what scorn the idea would provoke and put off detailed study of it until I had finished the
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