It's the inevitable logical conclusion based on how human reproduction works. The chance of getting the same spermatozoon in there, the same random genetic vari

It's the inevitable logical conclusion based on how human reproduction works. The chance of getting the same spermatozoon in there, the same random genetic variations, the same developmental conditions and so forth is infinitesimally small if the same exact conditions are not met. Even if we ignore all of that, there's still the swirling chaos of causality to contend with, forever altered by that small change...