'Sesame Street,' 'Dora the Explorer,' 'PAW Patrol,' 'Sofia the First': Fun facts about your favorite TV shows

Who was the first celebrity guest on "Sesame Street" in 1968? Did you know Dora the Explorer has a last name? What Beatles member was the storyteller on "Thomas & Friends"? What cartoon is the longest-running animated show for children, and which show is a preschooler favorite? …