N'ihi enweghị ihe ịga nke ọma na Germany, Zapf gara United States.
N'ezie, ụdị okwu dị mgbagwoju anya nke ahịrịokwu ahụ bụ "N'ihi na ọ nweghị ihe ịga nke ọma na Germany, Zapf gara United States, ebe ọ kụziri banyere ntinye kọmputa, ma kpọọ ya ka ọ kwuo okwu na Mahadum Harvard na 1964. "