This post is a response to an episode of the big bang theory
While there may not be an explicit reference to Kryptonian skin cells, this was still a foolish bet for Leonard to accept. Superman’s ability to store the yellow sun’s energy, acting as a battery, is firmly established in Byrne’s Man of Steel series from the 1980s. Even if it isn’t there, any edition of Who’s Who featuring Superman and many of the 80 page giants and Secret Origin stories will also contain this information in the supplementary information. Add in stories where his ‘batteryness’ is a plot point in the stories, I bet there are over 20 comics in the collection that enable Sheldon to win the bet.
It is a measure of futility to try and apply any physics to most super powers antrot Superman’s in specific. But occasionally comics give it a go. The result is that it is well established that he stores solar energy from yellow suns. As a result Supes is stronger than a locomotive, faster than a speeding bullet, and able to leap tall buildingsion a single bound. Plus he flies, has heat vision, invulnerable skin and so forth. It makes no sense but that is what it is.
As Raj points out, “The pretty girl has left the room.”