"Surely.  A man's life history can be told from his calluses.  I once did a monograph on them, published in The Witness Quarterly - like Sherlock Holmes' famous monograph on tobacco ash.  This young man from Mars since he has never worn our sort of shoes and has lived in gravity about one third of ours, should display foot calluses consonant with his former environment.  Even the time he recently spent in space should have left their traces.  Very interesting."