I don't know why the writers feel it important to provide every single detail of Peter and Olivia's formative years. If they want to tell us a few things about them, and why Walter wanted to unlock the secrets of universe crossing, I would have preferred the flashback method. And what exactly was learned? I thought Olivia grew up in a relatively stable environment - I mean, didn't she have a loving mother who we met in the alternative universe? Now we're being told the intense emotion/fear created when her father hit her, in conjunction with the injections from Walter, gave her the ability to cross over. Also - she met and was immediately smitten with Peter; even when he was a little boy. Gee. I suppose other questions were answered - I just don't know what they were.
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