Jayant RadhakrishnanChicago, Illinois, United States Important and affluent people have always sought immortality, or at least an inordinately long life, and medical systems have tried to deliver. Āyŭrvēdic, Egyptian, Chinese, Persian, and Greco-Arabic (Ǖnāni) medical systems prescribe diet, exercise, rest, mental peace, and herbs for longevity by promoting healthy living. Āyŭrvēdă also advocates Răsăyānă, an…