Although I'm not a massive fan of the series, I liked Tom Strong's origin (that Alan Moore again). His parents were scientists who wanted their son to have the best possible start in life, so as soon as he was born they placed him in a high-gravity chamber and force-fed him shakespeare and Einstein (or whatever). When he emerged, he was many times as strong as normal folk because his body had adapted to extreme gravity. And he was clever and well-adjusted ebcause of all the reading materials. Good old pseudo-science that kind of makes sense but you wouldn't try it yourself as it's frankly very cruel.