Mister Rogers' Neighborhood (1968)

Season 14: Episode 7

Mister Rogers arrives with a piece of string that came on a package. Using the loop, Mister Rogers shows a few games and tricks that can be played with such a string and then sings Did You Know. After a phone call from Jane Henshaw, Mister Rogers visits her at the Neighborhood dairy farm where he learns about cows. He also sees how cows are milked and how the milk is bottled.