What if one day you wake up in the most normal way but as the day goes on, you realise that all the people around feel completely different even though you see them everyday? Meaning, you are with similar faces and surroundings but actually in a completely different place (or different world might I add). This may seem like a plot of a science fiction movie, but the co-existence of worlds like our own is not entirely impossible according to some physicists. And some believe that communication and transportation are possible as well. Sci-fi fans must be aware of terms such as, parallel worlds, parallel universes (multiverse), etc., that are widely used to describe the theories of different worlds like our own. How did this idea of many-worlds come to be researched? Although these ideas have been around from ancient times, Hugh Everett III (American physicist) in 1957 started the idea of parallel universes with research in mind. Now, let us look at the variou...