Impressed
I'm impressed. I just watched the show from start to end and must say...they were VERY good at answering all questions that someone might have about time travel.
They answer all questions about what happens to Frank and the sphere as well as deal with alternate realities and the fuel source.
Overall, I am very impressed with thier logic.
The ONLY logic fallacy that I could find is the episode where Frank claims he is getting younger every time he backsteps. They mention this in one episode then don't cover it again. My own logic would say he should be getting older since he lives an extra 7 days each time he backsteps that no one else lives. I wish this last logic fallacy had been explained to make the show perfect.