His writings cover a broad range of subjects spanning the natural sciences, philosophy, linguistics, economics, politics, psychology and the arts.
hɪz ɹˈaɪɾɪŋz kˈʌvɚɹ ɐ bɹˈɔːd ɹˈeɪndʒ ʌv sˈʌbdʒɛkts spˈænɪŋ ðə nˈætʃɚɹəl sˈaɪənsᵻz, fɪlˈɑːsəfi, lɪŋɡwˈɪstɪks, ˌiːkənˈɑːmɪks, pˈɑːlətˌɪks, saɪkˈɑːlədʒi ænd ðɪ ˈɑːɹts.