Many teenagers listen to heavy-metal or thrash-metal songs on their ipods or MP3 players cranking the volume to maybe 90% or even 100% of the total volume. While this maybe enjoyable, this causes real harm to the ears. Listening to music really loud using head-phones and ear-phones can really damage your ears. An average human ear can tolerate about 50dB, but head-phones sometimes come out at 80dB or 90dB. So, you can see that it goes beyond the tolerable range and naturally, cause damage. Scientists have also proved that a person who regularly listens to music through head-phones have at least a thousand more bacteria than the average human. While most of these bacteria are not harmful, some such as Staphylococcus can cause ear-aches. Some teenagers who regularly listen to music need hearing aid while a lot of men in their 80s can hear really well. The only cause for this is the listening of music with the volume up! A recent science test has approved that:
