Well, personally I'm guessing that if there's a way it would be related, if not a direct consequence, to finding a way to leave this place on will. Even if finding the way to leave at will would still cause a memory loss, it's possible we could bring data over with us in the form of documents which would allow me to work on that. I think the main reason why we forget upon returning is a defense mechanism, maybe from our minds or this world itself, to avoid altering timelines too greatly.
[She remembers Goku being worried when Piccolo started telling them about the future, probably because Trunks' very existence was in danger at the moment. Back then, she doubts that either Vegeta or her would have reacted positively to the news, and she could see them never getting together just because of that. Because back then he still was, well, him, and Bulma was still stubborn and clinging to Yamcha out of pride and desperation.]
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branchandroot
[July 27th, Action]
Date: 2013-07-29 06:08 am (UTC)[She remembers Goku being worried when Piccolo started telling them about the future, probably because Trunks' very existence was in danger at the moment. Back then, she doubts that either Vegeta or her would have reacted positively to the news, and she could see them never getting together just because of that. Because back then he still was, well, him, and Bulma was still stubborn and clinging to Yamcha out of pride and desperation.]