How many different books are there in the world? It's a question Jon Orwant often hears. He's an engineering manager at Google Books -- part of the tech company's efforts to digitize all of the world's books. Recently, they announced an answer: 129,864,880. Melissa Block talks to Orwant about how Google came up with the number.
Google's Tally Of World's Book Titles: 129,864,880
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