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Nick Jr. (sometimes called Nick Jr. on Nickelodeon or Nick Jr. on Nick) is a block of TV shows on Nickelodeon every weekday morning. It started on January 4, 1988. The shows in this block are specially for preschoolers. Most of the shows are educational. Shows like Blue's Clues, Dora the Explorer, The Backyardigans and Ni Hao, Kai-Lan were made for the Nick Jr. block.