Hi all, I'm working on a short story vaguely concerning a proposed solution to the grandfather paradox where if you went back in time to kill your grandfather, you would be thwarted by a string of coincidences. While I don't believe coincidences are anything more than mental phenomena, for the purposes of the story, I do want to make the case as strongly as I can that they are something more than that. To this end, I've been googling my little heart out trying to find the most convincing example of a 'coincidence' in nature, but all I'm getting is stories about people thinking of someone and then them phoning them up, which is not helpful. So, can anyone give me some examples of the weirdest (or at least seemingly weird) coincidences from any of the physical sciences? Thanks very much!