Nemhaka yokuti akanga asina kubudirira muGermany, Zapf akaenda kuUnited States.
Chokwadika, shanduro yakaoma zvikuru yemutsara wacho ndeiyi "Nokuti akanga asina kubudirira muGermany, Zapf akaenda kuUnited States, kwaakadzidzisa pamusoro pekugadzira makombiyuta, uye akakokwa kutaura paYunivhesiti yeHarvard muna 1964".