According to the National Institute of Health, wearing headphones for just one hour increases the bacteria level in your ear 700 times.
For those who share headphones, the news is even worse. Because colonies of germs lurk inside and on the edge, headphones rank high on the list of things that should never be shared, right up there with tissues, hairbrushes and contact lenses. One study featured in the Online Journal of Health and Allied Services found that sharing headphones is one way to pass potentially illness causing germs from one person to another.
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