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"The Cookie Monster" is a 2004 Hugo Award-winning novella by Vernor Vinge.

The story begins following the first day of Dixie Mae Leigh's job as a customer support employee at a fictional company called Lotsatech. She receives an insulting and mysterious email and, in a fit of rage, decides to find out who sent it. She and a fellow employee Victor search the Lotsatech campus looking for the author of the email, going off of clues in the email header. They meet up with Ellen, a grad student in computer science, who decides to try and help Dixie Mae.

While they talk, several mysteries arise and convince them that the email may be a kind of warning about something going on at Lotsatech involving a professor named Gerry Riech, who seems to be involved in all the projects on the campus. Ellen finds another clue in the email leading the three to another building where, to their utter astonishment, a second Ellen appears. The only explanation of this is that they are being simulated by a computer. Further clues from another person in the building lead them to an underground lab where they find two researchers working on improving methods of producing and preserving Bose-Einstein Condensates.

When Dixie Mae and the Ellens reveal that they are all actually simulations, the researchers explore the email and find a clue that leads them to a 'cookie', a file that is passed from each iteration to the next with messages from the centuries of time they have been simulated over and over. They also find out that it was actually Dixie Mae herself who wrote the email in order to make it as offensive as possible to herself, allowing each iteration of the researchers to access the cookie. The story ends with a sad Dixie Mae realizing she can't do anything herself to stop the endless cycle they are all in, but through the passing of information and ideas from one iteration to the next someday they will have the ability to stop the simulations.

The Cookie Monster develops many ideas of personality uploads and neural simulations. The main theme of the story is that someone with the ability to simulate many people over and over again in any situation could be considered to be using a form of intellectual slavery. The person in the story who conceived and implemented the upload procedure, Gerry Riech, used the personalities he uploaded to produce scientific breakthroughs that he passed off as his own.

This is reminiscent of the debate in philosophy of artificial intelligence about whether or not a fully sentient AI can be considered alive. In this story the ethical question changes from "Does an artificial intelligence have rights?" to "Does an uploaded personality retain any of the rights the original person has?"

• Simulated reality