ɪt kənsˈɜːnz ɪtsˈɛlf wɪð ɐ pˈɑːsᵻbəl kˈɑːnsɪkwəns ʌvðɪ ɛɡzˈɪstəns ʌv pˈæɹəlˌɛl jˈuːnɪvˌɜːsᵻz, spəsˈɪfɪkli ðə wˈʌnz wˌɛɹ lˈaɪf ˌɔn ˈɜːθ nˈɛvɚ dɪvˈɛləpt.
It concerns itself with a possible consequence of the existence of parallel universes, specifically the ones where life on Earth never developed.