If you think it is annoying listening to the noise pollution from the headphones of obnoxious teenagers on your daily commute, spare a thought for people suffering from cardiac problems.
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A study by William Maisel at Beth Israel Medical Centre in Boston has found that magnetic interference from MP3s can interfere with heart pacemakers and implantable defibrillators.
This latest data, if found to be accurate, may prove rather inconvenient for MP3 makers. Annoying fellow passengers is one thing, but incidentally killing cardiac patients might turn off even the most obnoxious people from their MP3s.