Thanks to Superman Returns, there's been a fair amount of specials and debates over Superman's powers in relation to real life. National Geographic Channel had a really good one the other week.
I saw a link on slashdot.org today to an article titled
Astrophysics taking off on Superman . It doesn't go into depth too much, but I thought this bit was interesting.
Marti points to a book called "Great Mambo Chicken," which tells of a scientific experiment in which a researcher put several chickens in a centrifuge and raised them in twice-normal gravity for months at a time. When they emerged, the chickens were stronger and had larger bones and muscles, and greater endurance. In other words, they were superchickens.
So, the physicists say, it does work in the real world.