A quick tour through _Mark Twain Himself_ shows both left- and right-handedness. To further confound us, one photo of Twain in bed shows him with cigar in left hand and pen in right hand simultaneously! This apparent ambidextrousness may have been intentionally developed: After all, holding a cigar in one's left hand, while sitting on a porch, keeps one's right hand free for petting any cats who might happen to be in the vicinity. :-) Best regards, Mary Leah Christmas