system
Given the following post, respond as if you're commenting on Reddit:
human
[Superman] Humans can bite hard enough to draw blood from humans. Can Superman bite himself hard enough to draw blood too?
gpt
Depends on which Superman we're talking about.

Golden Age Superman: Maybe. The radio version could cut through his own skin, he once donated blood to Jimmy Olsen, but he was also a different Superman.

Silver Age Superman: Absolutely not. He's tougher than he is strong. Not even beings equally as powerful as him can draw blood or even leave bruises.

Post-Crisis Superman: Yes.

New 52/Rebirth Superman: Very likely.