Napalm, incendiary gel that sticks to skin and burns to the bone, came into the world on Valentine{u2019}s Day 1942 at a secret Harvard war research laboratory. On March 9, 1945, it created an inferno that killed over 87,500 people in Tokyo{u2014}more than died in the atomic explosions at Hiroshima or Nagasaki. It went on to incinerate sixty-four of Japan{u2019}s largest cities. The Bomb got the press, but napalm did the work. Robert Neer has written...