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This cover image released by Little, Brown & Co. shows "Revenge of the Tipping Point: Overstories, Superspreaders, and the Rise of Social Engineering" by Malcolm Gladwell. (Little, Brown & Co. via AP)

This cover image released by Little, Brown & Co. shows "Revenge of the Tipping Point: Overstories, Superspreaders, and the Rise of Social Engineering" by Malcolm Gladwell. (Little, Brown & Co. via AP)

This cover image released by Little, Brown & Co. shows "Revenge of the Tipping Point: Overstories, Superspreaders, and the Rise of Social Engineering" by Malcolm Gladwell. (Little, Brown & Co. via AP)

This cover image released by Little, Brown & Co. shows "Revenge of the Tipping Point: Overstories, Superspreaders, and the Rise of Social Engineering" by Malcolm Gladwell. (Little, Brown & Co. via AP)