ɪf ðə tʃˈæns ʌv lˈaɪf ɚɹˈaɪzɪŋ ˌɔn ˌɛni wˈʌn ʌv ðˌɛm ɪz ɐbˌaʊt fˈɪfti pɚsˈɛnt, ðˈɛn hˈæf ðə tˈaɪm ɐ ɹˈændəm tʃˈɔɪs əvə pˈæɹəlˌɛl jˈuːnɪvˌɜːs wɪl lˈiːd tʊ ɐ dˈɛd ˈɜːθ.
If the chance of life arising on any one of them is about 50%, then half the time a random choice of a parallel universe will lead to a dead Earth.