From The TV IV

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Noggin, was started as a joint venture between the Children's Television Workshop (who would soon sell their stake to Viacom) and Viacom. Noggin featured programming for preschoolers, much like Nick Jr, and featured original programming as well as Nick Jr. programming like Dora the Explorer. Soon Noggin would split in half, and the nighttime/evening half of the channel would become The N, a channel targeting viewers 12-24 with programming ranging from TV-G to TV-14. This shared channel space arrangement would continue until December 31, 2007 when The N would move to its own channel space and Noggin reclaimed the nighttime hours. Nickelodeon announced on February 24, 2009 that would be rebranding the network Nick Jr. on September 28, 2009 and refocus it on programming aimed at preschoolers.