Here's an interesting statistic... Headphones make your ear canals warmer, darker, and moister. After one hour wearing headphones, the bacteria in your ears has multiplied 600 times.
Now, granted, that's still not terribly much by the standards of the human body, and it's all in the outer ear, not inside the eardrum where normal ear infections occur... but it sure as hell ain't good for their ears.
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