Washington, Aug. 3 -- Al Qaeda head Ayman al-Zawahiri was killed by two missiles fired at his Kabul home - but pictures showed no sign of an explosion. That points to the use of the Hellfire R9X, a missile dubbed the "flying ginsu", after a famous 1980s television commercial for ostensibly Japanese kitchen knives that would cut cleanly through aluminum cans and remain perfectly sharp.P2...