Asgard hand device

An Asgard hand device is a device was used by an unnamed Asgard to remove the knowlege of the Ancients which had been downloaded into Jack O'Neill's mind after he looked into an Ancient repository of knowledge on P3R-272. The knowledge within the repository was so vast that it could not be handled by the mind of a modern-day human, which had not yet evolved to that point, and was quickly overwhelming O'Neill's mind. If the knowledge had been allowed to continue to unfold, it would have resulted in O'Neill's death. Realizing the danger he was in, his subconscious mind developed way to restore him and save his life. After building a device to supply him with enough power and reconfiguring the SGC dialing computer to allow intergalactic gate travel, O'Neill traveled to the Asgard homeworld, where he was met by a group of Asgard. O'Neill was restored, but the knowledge was completely removed.