He wrote about an encounter in Brazil with a Japanese abacus expert, who challenged him to speed contests between Feynman's pen and paper, and the abacus.
hiː ɹˈoʊt ɐbˌaʊt ɐn ɛŋkˈaʊntɚɹ ɪn bɹɐzˈɪl wɪð ɐ dʒˌæpənˈiːz ˈæbækəs ˈɛkspɜːt, hˌuː tʃˈælɪndʒd hˌɪm tə spˈiːd kˈɑːntɛsts bᵻtwˌiːn fˈeɪnmənz pˈɛn ænd pˈeɪpɚ, ænd ðɪ ˈæbækəs.