You want some science? I can go to the titty bar, make it rain science and my currency will be accepted. Lois Lane has prosopagnosia. That's science wedged between your hip and your g-string, baby. But you don't really believe a man can fly, do you?
Actually, something about Supermans aura causing temporary prosopagnosia was suggested in one of the comics, I believe. It's like dreaming of people, you can't remember the faces.
Doesn't explain photographs of Superman, though.