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Changing history only changes a single concept when a lot more should be changed
Sorry I'm still trying to make the laconic shorter. Can anyone help with that? Anyway, this is a subtrope of Butterfly of Doom. Theoretically if you were to travel back in time and kill someone famous like say, Thomas Edison(hypothetically!), not only will he have never invented the light bulb(in fact, it's more likely that someone else would eventually figure it out), but many more alterations would be made in the present. For example, people's relationships with others, their career status or if they were ever even born. Not so much in fiction. If you take the above example then fictional time travel will usually only make alterations to selectively erase all of Edison's inventions. That is the Selective Butterfly, when changing history through time travel, even from far back in the prehistoric time, only changes one concept, when realistically a whole lot more should be changed as a result, but remain untouched. ---