Just rewatched 'parallels', awesome ep imho. Though I started wondering.... it seems that in the very first 'jumps', the differences were marginal, only progressively becoming more important (e.g. beginning with a different type of cake and ending with him being first officer, and married with children). And I was wondering if there 'd be a kind of 'rule' to this. Of course, I understand it suits the storytelling this way, building suspense and such... had he jumped straight to the last universe, he would immediately have known that something was very wrong and that would have spoiled the story. However, I'm curious for the erm, between-universes-explanation. The concept seems somewhat different from 'sliders', where each jump is essentially fairly random. So what makes the differences steadily 'worse'? Is it simply a matter of 'random walk', taking Worf generally 'further' from the prime timeline gradually? Or would there really be a mechanism involved that would be going back to earlier and earlier branching points (generally resulting in larger differences). Or something else still? Also, I was wondering what the 'limits' would have been. Could he eventually have ended up in a universe where there never existed any federation or even klingons and humans at all ? Or would he simply be 'stuck' as soon as he reached a universe where Geordi's VISOR (or any devices generating a similar field) didn't exist ?