|Air date||November 23, 1972|
|Season||Season 4 (1972-1973)|
- Bob gets a lesson in ecology when he finds that his garbage can be used by other residents of Sesame Street.
- Cartoon: A girl inflates a balloon in the shape of an S.
- Cartoon: A green man demonstrates dark and light.
|Previous episode:||Next episode:|
|Episode 0413||Episode 0415|
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