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"Back to the Future" questions you want answe...

Why was the sports almanac from "Back to the Future" so thin? Why didn't Biff disappear after changing his past? In celebrating "Back to the Future" day, the film's co-writer Bob Gale and film score composer Alan Silvestri answer burning plot questions from CBSN's Vladimir Duthiers and CNET Senior Editor Jeff Bakalar.
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