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Semi-spoiler, don't read if you haven't heard/read Singularity
-it isn't your science, it's the concept of time travel. it has been a LONG time since i took my astronomy/cosmology classes (mumoo00, cosmology is NOT cosmotology, again, ask wallerdad). i know time gets all fritz around black holes/singularities. but to actually travel through time?? i like how you delt with it. if time travel IS possible, then the timeline cannot be changed, because going back in time just means you are a part of history, not changing it, so you where destend to travel back in time in the first place. hence history isnt changed, nothing is different in the historical perspective. did i mention i hate time paradoxes?? they make for fun scifi stories and TV programs, but in the real world... let's just say that's a different story...
how you explained it and delt with it was fabulous. Got some old cogs in this old brain spinning again.
By the by, i am a math/science teacher, undegrad in is geology, masters is in math, so i enjoy the science, when it is done right. like i said, you did an excellent job with your science, not to mention your story telling. i will be wanting on your next book, i ALMOST bought your book in the stores way back when it first came out, now i wish i had, wife tells me i should listen more to my instincts, being a logic based person, i have troubles with that, oh well... life, she throws us curves and laughs when we fall down.