Generally speaking I think if you try to catch a guy with one, sure you can probably notice. But most people probably aren't trying to, and so they generally go unnoticed. I only ever happen to see it if my eyes happen to wander in that direction unintentionally. I don't really think it's a big deal, it's just a fact of life.
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"The world is so exquisite with so much love and moral depth, that there is no reason to deceive ourselves with pretty stories for which there’s little good evidence. Far better it seems to me, in our vulnerability, is to look death in the eye and to be grateful every day for the brief but magnificent opportunity that life provides"
-Carl Sagan
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