Isaac Newton devoted considerably more of his writing to the study of alchemy (see Isaac Newton's occult studies) than he did to either optics or physics.
ˈaɪsək nˈuːtən dɪvˈoʊɾᵻd kənsˈɪdɚɹəbli mˈoːɹ ʌv hɪz ɹˈaɪɾɪŋ tə ðə stˈʌdi ʌv ˈælkəmi sˈiː ˈaɪsək nˈuːtənz əkˈʌlt stˈʌdiz ðɐn hiː dˈɪd tʊ ˈiːðɚɹ ˈɑːptɪks ɔːɹ fˈɪzɪks.