ðiːz ɑːɹ tˈuː dˈɪfɹənt kˈaɪndz ʌv ˌɪntəlˈɛktʃuːəl æktˈɪvᵻɾi, wˌɪtʃ mˈeɪ biː kəndˈʌktᵻd baɪ ðə sˈeɪm pˈɜːsən æz ɪnðə kˈeɪs ʌv ˈaɪnstaɪn ɔːɹ baɪ dˈɪfɹənt pˈiːpəl.
These are two different kinds of intellectual activity, which may be conducted by the same person (as in the case of Einstein) or by different people.