To cry or not to cry: that is the question. Whether or not Hillary Clinton actually shed any tears when things looked bad in New Hampshire, she certainly had a wet-eyed wobble, and it hasn't done her any harm. Not yet, anyway. But what of the rest of us? Is crying a sign of weakness if we allow it to happen in a professional capacity? Will it be the kiss of death for an otherwise promising career? Or can it be part of the armoury of the successful professional?