|Plot||Oscar keeps airplanes away from his trash can.|
|Air date||May 1, 1973|
|Season||Season 4 (1972-1973)|
- David demonstrates the sound of the letter H.
- Maria classifies by form.
- Bob pours a pitcher of water on a newspaper to demonstrate wet and dry.
|Previous episode:||Next episode:|
|Episode 0526||Episode 0528|