My grandfather’s trail Crystal clear,
Sharp and bright,
The sacred sword
Allows no opening
For evil to roost. — Morihei Ueshiba (1883–1969), founder of Aikido, (the Way of Harmony), in The Art of Peace, translated by John Stevens Seventy-five years ago today, Robert Oppenheimer, with my maternal grandfather, Enrico Fermi (1901–1954), and their…