M theory is an 11 dimensional theory which in some limits can reproduce all the five 10 dimensional string theories, and also 11D supergravity in some other limit. The mantra of string theory has been, for years, "we do not know what M-theory is". On the other hand, 11 dimensional space is the minimal Kaluza Klein extension to reproduce the standard model group. This was noted time ago by Witten, the same person who took the effort of promoting M-theory. Also, an string theory should be expected to emerge from the standard model in the limits where confinement appears; the string being the cause of the confinement. There are even some different limits to produce strings, depending on phases of the theory. So I wonder, could it be possible to manipulate the parameters of the standard model in order to reproduce each of the five superstring theories?