I went on to test the program in every way I could devise. I strained it to
expose its weaknesses. I ran it for high-mass stars and low-mass stars, for
stars born exceedingly hot and those born relatively cold. I ran it assuming
the superfluid currents beneath the crust to be absent -- not because I wanted
to know the answer, but because I had developed an intuitive feel for the
answer in this particular case. Finally I got a run in which the computer
showed the pulsar's temperature to be less than absolute zero. I had found
an error. I chased down the error and fixed it. Now I had improved the
program to the point where it would not run at all.
-- George Greenstein, "Frozen Star:
Of Pulsars, Black Holes and the Fate of Stars"
