Joan Ganz Cooney of the Children's Television Workshop (now Sesame Workshop) created this hourlong PBS series in 1969. Initially, it was created as a means of preparing young inner-city children for kindergarten. Instead, it got to everybody and became one of the all-time great educational shows.

    The show teaches literacy, counting, simple logic , and social skills through a kaleidoscopic mix of puppetry, animation and short films. In a radical departure for the time, it was designed to deliberately mimic the fast pace and style of TV advertising in order to 'sell' learning to kids: An Aesop-friendly story featuring the recurring characters on the Street would be intercut with rapid-fire 'commercials' for that day's 'sponsors' ("Sesame Street has been brought to you today by the letters A and S, and the number 7..."). Other "commecial" segments featured songs, cartoons, and more all with a different educational lesson.

    The show was — and still is — also revolutionary in having an elite squad of educators and child psychologists pore over every single aspect of every segment in the whole show. "Sesame Street" has been called a living laboratory, and the show has been constantly tweaked to introduce new curriculum and improve its educational value.

    Although aimed at preschool children, Sesame Street deliberately includes enough mainstream pop culture references to entertain older children and parents as well, the better to encourage family involvement in the learning process.

    Through all changes, one thing remains, a varied cast of colorful puppets(known as Muppets) interact with a varied human cast in an inner-city environment. Originally, humans would remain on the street and Muppets in "commercials" but the show was re-tooled early on so they all would interact.