Chicken egg shop, Ukraine

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A professor of mathematics went mad and ended up in an insane asylum. He runs there on(//tractor-service.com)
corridors, rushes at psychos with shouts: "I'm integrating! I'm differentiating!".
Psychics, of course, run away in horror, only one stands and laughs. Professor,
a spray of saliva rushes to him: "I'm integrating! I'm differentiating!". And that one
replies: "No shit! I'm in degree x!".