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Episode 0175
| Sesame Street | |
| Plot | |
| Air date | January 8, 1971 |
| Season | Season 2 (1970-1971) |
| Sponsors | O, Y, 3 |
| Syndication | |
| Releases | |
Added by Oscarfan- Professor Hastings talks from a dump truck and shows how two trucks can be alike and also different.
- An Anything Muppet man uses feathers and rocks to teach the difference between heavy and light. During the lecture, Cookie Monster comes along, mistakes the rocks for cookies, and eats them all. The rocks weigh Cookie down, so the monster proceeds to eat the feathers to "balance it out."
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