Because in 1666 an apple fell on Newton's head Our modern view of gravity from this event was bred 'Till Einstein came along and said "Newton man, you suck. It's obvious that space-time controls gravity, you shmuck." The unification wasn't to come from relativity So then Einstein spent his later years in mental misery Then in 1968 the world of physics it did change And through the years a new theory arrived and it was strange It said the world we live in is comprised of not but strings These tiny bits of energy, these crazy wiggly things It finally made the subatomic forces work with gravity The quantum world and Einstein became one big family Marimba solo! *Instrumental* We're riding the knowledge express man! *more instrumental* Oh well with string theory uncertainty had shown its ugly face There were five versions each unique so which should we embrace Then Edward Witten came along and said "Hey guys, shut up." There's eleven dimensions P-branes, D-Branes, and much more close up The world gave out a collective "ahh" and everyone did understand The universe and unification might be close at hand See, different string vibrations cause the particles we know And each dimension helps explain why strings move just like so We may be just a membrane and our world is not unique There may be many other universes so to speak But in this crazy string based world there's so much we can do So man, just lay back and let the super symmetry work for you.