‘Don’t I have to watch out for paradoxes? Isn’t there a risk I’ll become my own grandfather or something?’

‘You can only go as far back as your own birth,' said Duncan, 'so there’s zero chance of triggering a grandfather paradox. It’s not impossible you could screw up the timeline somehow, but in practice, how would you even know? We all finish up in the same reality in the end.’

I scratched my head. ‘This is going to get confusing, isn’t it?’

‘Yes,’ said Ruth. ‘I’m afraid so.’

'How Soon Is Now?'