In a quiet environment you can use an ear sufficiently understood. But life takes place largely outside the living room. Problems occur especially if a lot of mean people - for example, roommates, friends, acquaintances or colleagues - in a noisy environment by talking. In such situations you have two similar and equal working ears needed.
Why? If the brains of both ears receive sound signals, your hearing is capable of amazing things: they suppress the background noise and filtering the speech from the hubbub.
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