 A second argument from STR to perdurantism proceeds via the debate about time (see  section 6).  According to STR, for many events there is no absolute fact of the matter as to whether those events are simultaneous with now. That’s to say, at any moment, there is no absolute fact of the matter as to which events are present. This makes life difficult for presentists, who claim that only present events exist. If STR thereby rules out presentism, and if endurantism requires presentism in order to explain change (see  section 3),  then STR rules out endurantism: things have temporal parts. But not all endurantists agree that they must be presentists, and not all presentists agree that their view is undermined by STR.