The "Goodnight Mo" application has shot to the top of the U.S. app charts for books since its release Oct. 3. It's the most successful launch so far for Dublin-based StoryToys, which produced the Chuggington animated series. The app's new characters talk tots through their bedtime routine. "We are delighted and proud that 'Goodnight Mo' has proven such a hit with parents and children around the world," chief product officer Emmet O'Neill says.
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