It's our shared now dude. We're in the here and now. Ben Franklin is dead as a motherfucker.
The hedge is in case there are some where medicine advances to the point where we live 1000 years :)
> There's only one now
Why, because you experience it? Is that different from saying the only place that exists is your office? That's just where you are.There's nothing outside this one moment, ever.
It all moves together in perfect unison and that's why the speed limit is the speed of light.
Edit: for all these other histories happening outside of the now, they can't change shit about their timelines so they obviously don't have the same freedom of movement we do, do they?