Unfortunately, I don't remember the name of the star of this story,
but I'm told that there was a notable mathematician who believed
the *Perfect Graph Conjecture* to be false
and spent many years trying to prove it one way or another.

Meanwhile, another mathematician (presumably László Lovász) announced that he had found a proof (in the affirmative).

Upon hearing the news that the open question had been resolved, the first mathematician was able to produce a proof within 90 minutes.

Once again showing that it's much easier to do something once you know it can be done.