Past accounts suggest Siegel and Shuster, both 17, awkward and unpopular in high school, invented the meek Clark Kent and his powerful alter-ego, Superman, to attract girls and rise above their humble Cleveland beginnings.

But now it appears that the origin might have been more profound — that it was the death of Jerry Siegel's father that pushed the devastated teen to come up with the idea of a "Superman" to right all wrongs.