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What was the true extent of Guinan's abilities? I noticed in several episodes that alterations to the time stream didn't affect her, i.e. her memory was unaffected. Even more strange, Q seemed to be unsettled by her...the first time he seemed startled, even afraid. And then there's the fact that apparently her species is so long-lived that in 500 years she didn't appear to have aged a day. Can someone enlighten me?