Assertion: science fiction's premise | /r/CapableOf | involve changing history
Facets:
value: by accident
type: MANNER
value: oftentimes
type: TEMPORAL
Source sentences:
text: The central premise for these stories oftentimes involves changing history, either intentionally or by accident, and the ways by which altering the past changes the future and creates an altered present or future for the time traveler when they return home.