The Link, a neural interface with a large archive of knowledge, worked on the planet P3X-289 as a guard over the population against the toxic environment on the planet. Survivors from the planet accessed what they called the Link, through a device attached to the side of the head, for retrieving any needed information. They survived for 400 years in this fashion because of the Link controlling the large energy dome in which they lived and shielding them from the outside toxicity. However, the people didn't know the Link altered their minds so they wouldn't be aware that their numbers had decreased over 300 years from a thriving 100,000 people to a mere 1,000. (SG1: "Revisions")

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