"A secondary the size Wise reported would need to fully consume 90% of its thermonuclear fuel, including the uranium, in order to produce the W-88 warhead's advertized yield of 475 kilotons. If that calculation is correct, there is little wonder the W-88 warhead is still our most modern warhead, despite its being a twenty-five year old, mid-1970s design. It would be a waste of time trying to squeeze out the last 10%. I was recently told that 1962 was the year when weapon designers 'ran out of things to invent.' A dozen years later, they apparently gave up trying."
-- Howard Morland