Somebody noticed that the strings on an instrument vibrate at different frequencies depending on their lengths and tautness, the math formulas describing these characteristics looked similar to the modes of vibrations in some subatomic particles, so a person shot out a paper postulating that maybe sub atomic particles could be tiny vibrating strings.
The idea was shot down again and again but they kept coming back with "what if" scenarios, by increasing the parameters in which the strings might exist. Now they need 11 dimensions or else they won't work. Of course none of it has been proven, and all they have are descriptive math formulas, but for some reason this idea is forced upon particle physics students, and taught to the public as though it is almost completely proven, and alls they need is just a little bit more to understand "everything."
In my opinion, it's one of the greatest feats of misdirection and misadventure of both brains and monies to be accomplished within this generation.