String theory began as bosonic string theory, whose 26 dimensions act as many fewer. Yet this modeled only bosons, which are energy particles, while omitting fermions, which are matter particles. So bosonic string theory could not explain matter. Yet by adding supersymmetry to bosonic string theory, fermions were achieved, and string theory became "super"string theory, explaining matter, too.
s t ɹ ɪ ŋ WORD_BOUNDARY θ iə ɹ i WORD_BOUNDARY b ɪ ɡ æ n WORD_BOUNDARY æ z WORD_BOUNDARY b ə s ɑ n ɪ k WORD_BOUNDARY s t ɹ ɪ ŋ WORD_BOUNDARY θ iə ɹ i WORD_BOUNDARY h uː z WORD_BOUNDARY t w ɛ n t i WORD_BOUNDARY s ɪ k s WORD_BOUNDARY d ɪ m ɛ n ʃ ə n z WORD_BOUNDARY æ k t WORD_BOUNDARY æ z WORD_BOUNDARY m ɛ n i WORD_BOUNDARY f j uː ə ɹ WORD_BOUNDARY j ɛ t WORD_BOUNDARY ð ɪ s WORD_BOUNDARY m ɑ d ə l d WORD_BOUNDARY oʊ n l i WORD_BOUNDARY b ɑ s ə n z WORD_BOUNDARY w ɪ t̠ʃ WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY ɛ n ə ɹ d̠ʒ i WORD_BOUNDARY p ɑ ɹ t ɪ k ə l z WORD_BOUNDARY w aɪ l WORD_BOUNDARY oʊ m ɪ t ɪ ŋ WORD_BOUNDARY f ɜː m iə n z WORD_BOUNDARY w ɪ t̠ʃ WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY m æ t ə ɹ WORD_BOUNDARY p ɑ ɹ t ɪ k ə l z WORD_BOUNDARY s oʊ WORD_BOUNDARY b ə s ɑ n ɪ k WORD_BOUNDARY s t ɹ ɪ ŋ WORD_BOUNDARY θ iə ɹ i WORD_BOUNDARY k ʊ d WORD_BOUNDARY n ɑ t WORD_BOUNDARY ɛ k s p l eɪ n WORD_BOUNDARY m æ t ə ɹ WORD_BOUNDARY j ɛ t WORD_BOUNDARY b aɪ WORD_BOUNDARY æ d ɪ ŋ WORD_BOUNDARY s uː p ə ɹ s ɪ m ə t ɹ i WORD_BOUNDARY t ə WORD_BOUNDARY b ə s ɑ n ɪ k WORD_BOUNDARY s t ɹ ɪ ŋ WORD_BOUNDARY θ iə ɹ i WORD_BOUNDARY f ɜː m iə n z WORD_BOUNDARY w ɜː ɹ WORD_BOUNDARY ʌ t̠ʃ iː v d WORD_BOUNDARY æ n d WORD_BOUNDARY s t ɹ ɪ ŋ WORD_BOUNDARY θ iə ɹ i WORD_BOUNDARY b ɪ k eɪ m WORD_BOUNDARY s uː p ə ɹ WORD_BOUNDARY s t ɹ ɪ ŋ WORD_BOUNDARY θ iə ɹ i WORD_BOUNDARY ɛ k s p l eɪ n ɪ ŋ WORD_BOUNDARY m æ t ə ɹ WORD_BOUNDARY t uː WORD_BOUNDARY