If you wear headphones without any sound, just to separate the outside world, don't do it. Wear an ear protection instead (and don't care about your colleagues, at least they will know now what's the deal). There are sounds in the 16-20Khz range which you cannot hear already (due to aging), but still can damage your ears. Consider some "funny" guys whose hiding these high pitch sounds in videos or programs...
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If you wear headphones without any sound, just to separate the outside world, don't do it. Wear an ear protection instead (and don't care about your colleagues, at least they will know now what's the deal). There are sounds in the 16-20Khz range which you cannot hear already (due to aging), but still can damage your ears. Consider some "funny" guys whose hiding these high pitch sounds in videos or programs...