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What "The Simpsons" 15-th episode about
After a field trip to the desert, Lisa discovers that the desert water mysteriously makes typically combative creatures get along, so she brings some of the water home as a souvenir.
When Grampa moves in with the family after getting kicked out of the retirement home, Homer secretly tests the desert water on Grampa, who is instantly cured of his crankiness.
Episode number: 15
Episode name: "The Scorpion's Tale"
Episode release date: 7 march 2011 at 01:00
Status: aired
Rating: 6.6