Not so much a riddle, or puzzle, but I was watching TV today, and in Doctor Who I think it was they brought up the old sci-fi favourite of parallel universes. Though all the ‘parallel’ universes that I can think of in sci-fi are far from parallel, the definition of parallel being two lines that stay uni-distant from each other and never, ever, ever cross. Though ‘parallel’ universes in sci-fi usually stem from a sort of ‘what-if’ premise, like what if dinosaurs were never wiped out, or what if the Nazis won the Second World War. The two universes share a point in time where everything was the same for both of them, and from that point they become increasingly different, surely making them more of a fork-universe. A thought has just come to me, perhaps they are called parallel universes because they never come into direct contact with each other, but then this is also a fallacy, because the very nature of the one of the characters from ‘our’ universe being in the ‘parallel’ universe means that they have just met, meaning that surely they were never parallel in the first place. Anyway as no one I know would listen to me I thought that someone out there might have an opinion on the matter.