In a previous era of bomber aircraft there were positions throughout the plane that were manned machine gunners. One such weapon position in the very front, or nose, of the aircraft was referred to as the nose gun. It’s a pun.
With a branching timelines theory you don’t create loops you create cascades. Since you can’t make changes to an existing timeline you create a new timeline every time you go back. You would end up spawning an infinite number of timelines.
24 January 2024 (sh.itjust.works)
"If I knew then what I know now" by Port Sherry (i0.wp.com)
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