time travel - How is the Thomas Granger coma/"recursive" problem in Primer caused by a paradox?

In the movie, Thomas Granger gets knocked out simply by getting too close to Aaron. The narrator then states that the problem was "recursive"; also, some viewer explanations state that Granger falls into a coma because his interaction with Aaron/Abe when he comes back results in them not telling the native version of Granger about the boxes, and therefore the time-travelling Granger "could not exist".

How is that even a problem though? Throughout the movie, time-travelling versions of Aaron and Abe drug their doubles, preventing them from getting into the boxes and time travelling themselves. This doesn't seem to affect the time-travelling Aarons/Abes though, so why would a time-travelling Granger be affected?

Aren't the timelines independent? Any action that a time traveller performs that would prevent his/her double from time travelling shouldn't matter, because the time traveller's native timeline is independent from the current timeline that he/she finds him/herself in.

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Why didn't The Doctor or Clara recognize Missy right away?

So after it was established that Missy is actually both the Master, and the "woman in the shop" who gave Clara the TARDIS number... ...why didn't The Doctor or Clara recognize her right away? I remember the Tenth Doctor in The Sound of Drums stating that Timelords had a way of recognizing other Timelords no matter if they had regenerated. And Clara should have recognized her as well... I'm hoping for a better explanation than "Moffat screwed up", and that I actually missed something after two watchthroughs of the episode. Answer There seems to be a lot of in-canon uncertainty as to the extent to which Time Lords can recognise one another which far pre-dates Moffat's tenure. From the Time Lords page on Wikipedia : Whether or not Time Lords can recognise each other across regenerations is not made entirely clear: In The War Games, the War Chief recognises the Second Doctor despite his regeneration and it is implied that the Doctor knows him when they fir

Did the gatekeeper and the keymaster get intimate in Ghostbusters?

According to TVTropes ( usual warning, don't follow the link or you'll waste half your life in a twisty maze of content ): In Ghostbusters, it's strongly implied that Dana Barret, while possessed by Zuul the Gatekeeper, had sex with Louis Tully, who was possessed by Vinz Clortho the Keymaster (key, gate, get it?), in order to free Big Bad Gozer. In fact, a deleted scene from the movie has Venkman explicitly asking Dana if she and Louis "did it". I turned the quote into a spoiler since it contains really poor-taste joke, but the gist of it is that it's implied that as part of freeing Gozer , the two characters possessed by the Keymaster and the Gatekeeper had sex. Is there any canon confirmation or denial of this theory (canon meaning something from creators' interviews, DVD commentary, script, delete scenes etc...)? Answer The Richard Mueller novelisation and both versions of the script strongly suggest that they didn't have sex (or at the very l

the lord of the rings - Why is Gimli allowed to travel to Valinor?

Gimli was allowed to go to Valinor despite not being a ring bearer. Is this explained in detail or just with the one line "for his love for Galadriel"? Answer There's not much detail about this aside from what's said in Appendix A to Return of the King: We have heard tell that Legolas took Gimli Glóin's son with him because of their great friendship, greater than any that has been between Elf and Dwarf. If this is true, then it is strange indeed: that a Dwarf should be willing to leave Middle-earth for any love, or that the Eldar should receive him, or that the Lords of the West should permit it. But it is said that Gimli went also out of desire to see again the beauty of Galadriel; and it may be that she, being mighty among the Eldar, obtained this grace for him. More cannot be said of this matter. And Appendix B: Then Legolas built a grey ship in Ithilien, and sailed down Anduin and so over Sea; and with him, it is said, went Gimli the Dwarf . And when that sh

fan fiction - Does the Interdict of Merlin appear in original Harry Potter canon?

In Harry Potter and the Methods of Rationality by Eliezer Yudkowsky a concept called the ' Interdict of Merlin ' appears: (all emphasis added) Chapter 23: His hand on the doorknob, Harry Potter already inside and waiting, wearing his cowled cloak. "The ancient first-year spells," Harry Potter said. "What did you find?" "They're no more powerful than the spells we use now." Harry Potter's fist struck a desk, hard. "Damn it. All right. My own experiment was a failure, Draco. There's something called the Interdict of Merlin -" Draco hit himself on the forehead, realizing. "- which stops anyone from getting knowledge of powerful spells out of books, even if you find and read a powerful wizard's notes they won't make sense to you, it has to go from one living mind to another. I couldn't find any powerful spells that we had the instructions for but couldn't cast. But if you can't get them out of old books,

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